{"title":"Fitting Caps","description":"\u003cp\u003eFitting caps are protective plugs and covers that seal open AN fittings, brake line ports, fuel system connections, and hydraulic line terminations on performance vehicles during assembly, storage, and shipping to prevent contamination, fluid loss, and corrosion at the critical sealing surfaces that determine whether a fluid system remains leak-free throughout its service life. In professional race shop environments, capping every open fitting before assembly is a standard discipline that prevents machining chips, dust, and moisture from entering fuel rails, brake master cylinders, oil cooler lines, and intercooler charge pipes where contamination causes immediate system failures or extended damage that is difficult to trace. Street performance builders use fitting caps during engine swaps, brake system refreshes, and turbocharger installations to protect component internals while sourcing remaining parts before final assembly. This collection covers AN cap fittings, line plugs, port covers, and protective covers for common automotive fluid system fitting sizes and configurations.\u003c\/p\u003e\u003ch4\u003ePopular Upgrades\u003c\/h4\u003e\u003cp\u003eAN cap fittings in -4, -6, -8, -10, and -12 AN sizes from Fragola, Earl's, and Russell cover the most common fuel, oil, and brake line sizes used in performance builds, providing a secure threaded cap that prevents contamination without leaving residue on the sealing threads. Brake line port caps for common master cylinder and caliper port sizes protect the tapered threads and bore entry during brake system assembly and bleed procedures, and plastic dust cap kits for NPT fittings protect fuel pressure sender ports and oil cooler connections during system cleaning. EFI fuel rail end caps and injector port plugs are essential tools for builders performing fuel system cleaning or injector service who need to pressurize individual sections of the rail for leak testing without routing fuel to other components.\u003c\/p\u003e\u003ch4\u003ePerformance and Handling\u003c\/h4\u003e\u003cp\u003eContamination entering a brake system during assembly is one of the most dangerous outcomes of skipping fitting protection during a performance brake build, as metal particles or moisture in the hydraulic fluid cause caliper piston seal damage and corrosive attack on master cylinder bore surfaces that are difficult to diagnose without complete system teardown. Fuel system contamination from uncapped fittings during engine bay assembly can block injector strainers and fuel pressure regulator valves on direct injection systems where the injector's fine orifice is far less tolerant of debris than port injection nozzles. Using a complete set of AN fitting caps organized by size during assembly eliminates the risk of any fitting being left open inadvertently, a discipline that professional builders consider non-negotiable on any pressure or vacuum fluid circuit.\u003c\/p\u003e\u003ch4\u003eWhat sizes of AN fitting caps do I need for a typical performance build?\u003c\/h4\u003e\u003cp\u003eA typical turbocharged street performance build requires -6 AN caps for fuel supply and return lines, -4 AN caps for vacuum and boost reference lines, -8 or -10 AN caps for oil feed and drain lines, and -12 AN caps for coolant and water-methanol injection lines, with the exact sizes determined by the fitting sizes specified in each component's technical documentation. Brake system builders need metric and SAE bubble flare line caps for master cylinder ports and caliper banjo bolt ports in the specific thread pitches used by each caliper manufacturer. Having a comprehensive cap kit with multiple quantities of each common size eliminates the assembly delay of discovering an uncapped fitting with no appropriately sized cap available.\u003c\/p\u003e\u003ch4\u003eAre AN fitting caps reusable?\u003c\/h4\u003e\u003cp\u003eAluminum AN cap fittings from quality manufacturers including Fragola and Earl's are fully reusable as long as the threads are not cross-threaded and the sealing face remains undamaged, making a quality cap kit a long-term workshop investment that pays for itself across multiple builds. Steel caps and NPT pipe thread caps are also reusable but should be inspected for thread damage before reuse, as a damaged NPT thread can permanently damage an expensive fitting or sensor port if forced into engagement. Plastic cap covers used for shipping protection are generally single-use items, and replacing them with threaded metal caps for assembly protection provides better sealing and reusability for the investment.\u003c\/p\u003e\u003ch4\u003eWhy These Parts Fit Right\u003c\/h4\u003e\u003cp\u003eEvery fitting cap in this collection is dimensionally specified by AN size, NPT thread pitch, or metric thread specification to match common performance automotive fitting standards without modification. Compatibility charts cross-reference cap sizes to popular fitting brands including Fragola, Earl's, Russell, and Aeroquip for direct replacement selection. Orders ship fast from stocked inventory to support your build timeline.\u003c\/p\u003e\u003cp\u003eComplete your fluid system build with \u003ca href=\"\/collections\/exhaust\"\u003eexhaust system components\u003c\/a\u003e, protect your intake assembly with \u003ca href=\"\/collections\/air-intake-systems\"\u003eair intake systems\u003c\/a\u003e, or browse \u003ca href=\"\/collections\/suspension\"\u003esuspension upgrades\u003c\/a\u003e to complete the performance package.\u003c\/p\u003e","products":[{"product_id":"deatschwerks-6an-orb-male-plug-low-profile-internal-allen-hex-incl-o-ring","title":"DeatschWerks 6AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl. O-Ring)","description":"DeatschWerks, LLC, founded in 2004, is a company dedicated to providing high-performance fuel system solutions. Located in Oklahoma City, Oklahoma, DW operates out of its own 36,000 sq. ft. facility that houses all of the company's functions including design, end-manufacturing, quality assurance, sales, marketing, and administration. DeatschWerks' roots were established by offering high flow drop-in fitment fuel injectors. In 2009 DW expanded into fuel pumps with the DW300 the first in-tank fuel pump to outflow the standard 255 LPH pump. Since then, DW has developed innovative fuel system components such as the in-line 250iL and 350iL pumps, modular surge tanks, conversion fuel rails, dual-stage fuel filters, and ethanol compatible fuel pressure regulators. Today, the DeatschWerks line-up of fuel system components includes over 500 SKUs covering Sport Compact, Modern Muscle, and Euro applications.","brand":"DeatschWerks","offers":[{"title":"Default Title","offer_id":39742610833487,"sku":"DWK6-02-0717","price":5.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/deatschwerks-6an-orb-male-plug-low-profile-internal-allenhex-incl_-o-ring-fitting-caps-deatschwerks-3.jpg?v=1698814777"},{"product_id":"deatschwerks-6an-orb-male-plug-low-profile-internal-allen-hex-incl-o-ring-anodized-matte-black","title":"DeatschWerks 6AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl O-Ring) - Anodized Matte Black","description":"DeatschWerks 6AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl O-Ring) - Anodized Matte Black","brand":"DeatschWerks","offers":[{"title":"Default Title","offer_id":40369864638543,"sku":"DWK6-02-0717-B","price":5.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/deatschwerks-6an-orb-male-plug-low-profile-internal-allenhex-incl-o-ring-anodized-matte-black-fitting-caps-deatschwerks.jpg?v=1699693998"},{"product_id":"deatschwerks-8an-orb-male-plug-low-profile-internal-allen-hex-incl-o-ring-anodized-matte-black","title":"DeatschWerks 8AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl O-Ring) Anodized Matte Black","description":"DeatschWerks 8AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl O-Ring) Anodized Matte Black","brand":"DeatschWerks","offers":[{"title":"Default Title","offer_id":40369864671311,"sku":"DWK6-02-0718-B","price":5.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/deatschwerks-8an-orb-male-plug-low-profile-internal-allenhex-incl-o-ring-anodized-matte-black-fitting-caps-deatschwerks.jpg?v=1717784090"},{"product_id":"deatschwerks-10an-orb-male-plug-low-profile-internal-allen-hex-incl-o-ring-anodized-matte-black","title":"DeatschWerks 10AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl O-Ring) - Anodized Matte Black","description":"DeatschWerks 10AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl O-Ring) - Anodized Matte Black","brand":"DeatschWerks","offers":[{"title":"Default Title","offer_id":40369864769615,"sku":"DWK6-02-0719-B","price":5.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/deatschwerks-10an-orb-male-plug-low-profile-internal-allenhex-incl-o-ring-anodized-matte-black-fitting-caps-deatschwerks-2.jpg?v=1707950707"},{"product_id":"fragola-10an-plastic-cap-10-pack","title":"Fragola -10AN Plastic Cap - 10 Pack","description":"Fragola -10AN Plastic Cap - 10 Pack","brand":"Fragola","offers":[{"title":"Default Title","offer_id":40615544356943,"sku":"FRA900808","price":12.12,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/fragola-10an-plastic-cap-10-pack-tools-fragola.png?v=1700222466"},{"product_id":"fragola-6an-plastic-plug-10-pack","title":"Fragola -6AN Plastic Plug - 10 Pack","description":"Fragola -6AN Plastic Plug - 10 Pack","brand":"Fragola","offers":[{"title":"Default Title","offer_id":40615544422479,"sku":"FRA900904","price":7.38,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/fragola-6an-plastic-plug-10-pack-tools-fragola.png?v=1700222474"},{"product_id":"fragola-8an-plastic-plug-10-pack","title":"Fragola -8AN Plastic Plug - 10 Pack","description":"Fragola -8AN Plastic Plug - 10 Pack","brand":"Fragola","offers":[{"title":"Default Title","offer_id":40615544455247,"sku":"FRA900906","price":7.38,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/fragola-8an-plastic-plug-10-pack-tools-fragola.png?v=1700222479"},{"product_id":"deatschwerks-10an-orb-male-plug-low-profile-internal-allen-hex-incl-o-ring","title":"DeatschWerks 10AN ORB Male Plug Low Profile Internal Allen\/Hex (Incl. O-Ring)","description":"DeatschWerks, LLC, founded in 2004, is a company dedicated to providing high-performance fuel system solutions. Located in Oklahoma City, Oklahoma, DW operates out of its own 36,000 sq. ft. facility that houses all of the company's functions including design, end-manufacturing, quality assurance, sales, marketing, and administration. DeatschWerks' roots were established by offering high flow drop-in fitment fuel injectors. In 2009 DW expanded into fuel pumps with the DW300 the first in-tank fuel pump to outflow the standard 255 LPH pump. Since then, DW has developed innovative fuel system components such as the in-line 250iL and 350iL pumps, modular surge tanks, conversion fuel rails, dual-stage fuel filters, and ethanol compatible fuel pressure regulators. Today, the DeatschWerks line-up of fuel system components includes over 500 SKUs covering Sport Compact, Modern Muscle, and Euro applications.","brand":"DeatschWerks","offers":[{"title":"Default Title","offer_id":40904631484495,"sku":"DWK6-02-0719","price":5.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/deatschwerks-10an-orb-male-plug-low-profile-internal-allenhex-incl_-o-ring-fitting-caps-deatschwerks-2.jpg?v=1717776677"},{"product_id":"deatschwerks-6an-female-flare-cap","title":"DeatschWerks 6AN Female Flare Cap","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003e6-02-0714\u003c\/span\u003e | \u003cstrong\u003eUPC:\u003c\/strong\u003e 00887753531964\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eDeatschWerks 6AN Female Flare Cap\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eDeatschWerks 6AN Female Flare Cap provides a secure seal for unused -6AN male flare fittings in high-performance fuel systems. This universal cap fits sport compact, modern muscle, Euro, and powersport applications to prevent leaks and maintain fuel pressure integrity. Crafted for reliability in demanding conditions.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet 6061-T6 Aluminum:\u003c\/strong\u003e Delivers strength and resistance to high pressures in fuel delivery setups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Anodized Finish:\u003c\/strong\u003e Protects against corrosion, fuel, and environmental damage for long-term use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAN -6 Flare Thread (9\/16-18 UNF):\u003c\/strong\u003e Ensures exact match with standard -6AN male flare fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated O-Ring Seal:\u003c\/strong\u003e Creates a leak-proof connection without additional sealants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e Adds minimal weight at just 0.05 lbs to keep systems agile\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eVerify mating fitting threads are clean and undamaged prior to installation\u003c\/li\u003e\n\u003cli\u003eSuitable for gasoline, E85, methanol, and diesel fuel systems\u003c\/li\u003e\n\u003cli\u003eRated for pressures up to 300 PSI in performance applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eHand tighten then add 1\/4 to 1\/2 turn. torque to 20-25 ft-lbs maximum\u003c\/li\u003e\n\u003cli\u003eCompatible with all SAE J514 AN-spec flare fittings. no additional hardware needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUniversal\u003c\/td\u003e\n\u003ctd\u003eAll\u003c\/td\u003e\n\u003ctd\u003ePerformance Vehicles\u003c\/td\u003e\n\u003ctd\u003eSport Compact, Muscle, Euro, Powersport\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhy Choose DeatschWerks?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOver 20 years pioneering fuel injectors, pumps, and components since 2004\u003c\/li\u003e\n\u003cli\u003eIn-house design, manufacturing, and testing in 36,000 sq ft Oklahoma City facility\u003c\/li\u003e\n\u003cli\u003e800+ SKUs engineered for precise fit and flow in aftermarket fuel systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Will this cap fit standard -6AN flare fittings?\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, it threads onto 9\/16-18 UNF male flare fittings common in AN fuel lines from all major brands\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What material and finish are used?\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Machined from 6061-T6 billet aluminum with a durable black hard anodized coating for fuel and corrosion resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What warranty coverage applies?\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Backed by DeatschWerks limited lifetime warranty against manufacturing defects when installed correctly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground or USPS Priority\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock - ships same or next business day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Protective bag in 2.5 x 2 x 1 inch box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DeatschWerks","offers":[{"title":"Default Title","offer_id":44401603051599,"sku":"DWK6-02-0714","price":5.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/SKU_6-02-0714_UPC_00887753531964.jpg?v=1769535213"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/collections\/fitting-caps.png?v=1782252300","url":"https:\/\/www.blackopsautoworks.com\/collections\/fitting-caps.oembed","provider":"Black Ops Auto Works","version":"1.0","type":"link"}