Nitrous Express 11708-90 90 Degree Blow Down Tube Plumbing Kit

The Nitrous Express 11708-90 is a 90 degree blow down tube plumbing kit designed to safely route nitrous oxide discharge out of the vehicle when a safety burst disc is ruptured. The 11708-90 includes an 8AN nut, sleeve, and an aluminum tube bent 180 degrees so that any nitrous discharge exits through the bottom of the vehicle rather than venting inside the cabin or engine bay. This kit connects to the blow-down port on Nitrous Express Lightning 500 bottle valves and other compatible NX valves. Proper blow-down tube installation is required by NHRA and most sanctioning bodies for race vehicles equipped with nitrous oxide systems. The 11708-90 is a universal fitment component compatible with any vehicle running an NX system with a compatible blow-down port. Note: this product carries a California Prop 65 warning.

Key Features

• 90 degree blow down tube routes nitrous discharge safely out of the vehicle in the event of burst disc rupture
• 180 degree bent aluminum tube directs discharge downward and out the bottom of the vehicle
• Includes 8AN nut and sleeve for secure, leak-free connection to the valve blow-down port
• Required by NHRA and most racing sanctioning bodies for nitrous-equipped race vehicles
• Compatible with NX Lightning 500 and other compatible Nitrous Express valve blow-down ports
• Universal fitment for any vehicle running a compatible NX bottle valve
• Lightweight aluminum construction

What's Included

• 1 x 8AN nut
• 1 x 8AN sleeve
• 1 x 180 degree bent aluminum blow-down tube

Specifications

Installation Notes

• Install the 8AN nut and sleeve onto the blow-down port of the Nitrous Express bottle valve
• Route the aluminum tube so the discharge end exits through the floor or bottom of the vehicle, directed away from any heat source, exhaust, or fuel components
• Secure the tube to prevent vibration and contact with moving parts
• Refer to Nitrous Express installation documentation (nhrablowoff.pdf) and your sanctioning body's rulebook for specific routing requirements
• Inspect fittings and tube condition before every race event
• Always install in conjunction with the correct rated burst disc (such as the 11712L for Lightning 500 valves)

Frequently Asked Questions

What is the Nitrous Express 11708-90 used for?
The 11708-90 is a blow-down tube plumbing kit that connects to the safety blow-down port on Nitrous Express bottle valves. It routes any nitrous oxide discharge safely out the bottom of the vehicle if the safety burst disc ruptures, preventing venting inside the engine bay or cabin.

Is a blow-down tube required for racing with nitrous?
Yes. The NHRA and most sanctioning bodies require a blow-down tube on any race vehicle equipped with a nitrous oxide system. The 11708-90 is designed to meet these requirements when properly installed.

What vehicles does the 11708-90 fit?
The 11708-90 is a universal fitment component that works with any vehicle running a compatible Nitrous Express bottle valve with a blow-down port, regardless of year, make, or model.

What does 8AN mean in the context of the 11708-90?
8AN refers to the fitting size used on the blow-down tube kit. AN (Army-Navy) fittings are a standardized thread and diameter specification widely used in motorsports plumbing. The 8AN nut and sleeve in the 11708-90 connect to the corresponding port on the Nitrous Express valve.

Can the 11708-90 be used with other brands of nitrous valves?
The 11708-90 is designed for Nitrous Express Lightning 500 and compatible NX valve blow-down ports. Compatibility with other brands depends on the port thread specification. Verify port compatibility before purchasing for non-NX valves.

What should be paired with the 11708-90 for a complete safety setup?
The 11708-90 should always be used with the appropriate rated burst disc for your valve, such as the 11712L 3000 PSI burst disc for Lightning 500 valves. The burst disc and blow-down tube work together as a complete safety system.

What warranty does the Nitrous Express 11708-90 carry?
Nitrous Express covers their products with a limited warranty against manufacturer defects in materials and workmanship.

Is the 11708-90 available in California?
The 11708-90 carries a Prop 65 warning. Check current California sales restrictions for nitrous accessories. Contact Nitrous Express directly at nitrousexpress.com for the most current California availability information.

WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer, and other chemicals known to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.