-29%
Click to zoom in
Kleinn 2121 is the Model 2121: Sealed Tank Mount Pressure Switch - 1/4" NPT (90 psi On / 120 psi Off). Match the exact manufacturer part number, configuration, voltage, pressure, dimensions, connections, included components, and vehicle application before ordering.
Key Features
- PRECISION-TUNED CALIBRATION: Engineered to kick in at 90 PSI and cut out at 120 PSI. This ensures your tank is always primed for massive air horn blasts.
- BATTLE-READY SEALED DESIGN: The fully sealed housing slams the door on moisture, dust, and road debris, making it the only choice for rugged under-vehicle mounting.
- ERROR-PROOF WIRING: With non-polarized leads, there is no "wrong" way to wire it—meaning faster installs and zero risk of wiring-induced failures.
- TOTAL SYSTEM FORTIFICATION: Designed to command a 12V ignition signal to a 40-amp relay, shielding your compressor from electrical burnout and maximizing its lifespan.
- (1) Model 2121 Sealed Tank-Mount Pressure Switch
Fitment
| Fitment Status | Universal only by exact specifications |
|---|---|
| Required Verification | Voltage, pressure, flow, duty cycle, dimensions, ports, air-line size, wiring, mounting, and companion components |
Specifications
| Brand | Kleinn Air Horns |
|---|---|
| Manufacturer Part Number | 2121 |
| Product Type | Air System Pressure Switches |
| Fitment Type | Universal |
| Condition | New |
| GTIN | 819147010908 |
| Part Number | Model 2121 |
| Warranty | 1-Year |
| Pressure On / Off | 90 PSI On / 120 PSI Off |
| Wiring | Two 12-Gauge non-polarized leads |
| Safety Valve Compatibility | Use Model 52145 |
| Tank Fitting Size | 1/4" M NPT |
| Protection | Sealed Design for Moisture Resistance |
| Compatible Relay | Model 340 40-amp SPDT 12v Auto Relay |
What's Included
- (1) Model 2121 Sealed Tank-Mount Pressure Switch
- (2) Heavy-Duty 12-Gauge Non-Polarized Wire Leads
- (1) 1/4" NPT Male Fitting (Pre-applied Thread Sealant)
About Kleinn Air Horns
Kleinn develops vehicle-specific and universal train horns, air horns, onboard-air systems, compressors, tanks, valves, controls, and remote-start systems. Every pressure, electrical, dimensional, and vehicle requirement remains exact-part specific.
Related Kleinn Air Horns Products
- Shop all Kleinn Air Horns products
- Kleinn Sealed Tank Mount Pressure Switch/ 1/4In M NPT/ 100 PSI On/ 130 PSI Off
- Kleinn Sealed Tank Mount Pressure Switch/ 1/4In M NPT/ 110 PSI On/ 145 PSI Off
- Kleinn Dash Mount Analog Air Pressure Gauge/ 0-250 PSI - 1/4In M NPT Inlet
Frequently Asked Questions
What must match before installing Kleinn 2121?
Confirm voltage, pressure, flow, duty cycle, port and air-line sizes, dimensions, mounting orientation, wiring load, and compatibility with every connected component.
Is Kleinn 2121 compatible with my existing air system?
Match the exact voltage, pressure range, duty cycle, port thread, air-line diameter, current draw, dimensions, and mounting requirements. Similar-looking components are not automatically interchangeable.
What should be checked after installing Kleinn 2121?
Leak-test every pneumatic connection, verify electrical protection and operating pressure, secure all wiring and air line, and recheck mounting hardware after the first operating cycle.
Installation Instructions
Confirm Kleinn part number 2121 and the complete application before beginning. Mount every component in the specified orientation, use correctly sized fused wiring and protected grounds, route air line away from heat and moving parts, seal only the approved threads, leak-test the system, verify cut-in and cut-out pressure, and confirm safe operation before driving.
