Flojet 20378-003 Bypass Kit, 60-80 PSI
The Flojet 20378-003 is the genuine bypass kit set for 60-80 PSI. A bypass is an internal pressure-relief path: when the discharge pressure reaches the set point, it opens and recirculates flow back to the inlet instead of letting pressure keep climbing.
The benefit is most obvious on systems with several outlets or a spray head. Without a bypass, closing the last outlet means the pump is suddenly working against a dead end, and it stays there until the pressure switch reacts — with the motor stalled against full pressure in the meantime. With a bypass, the flow simply circulates and the pump keeps turning freely. It also smooths delivery when an outlet is only partly open, because the bypass absorbs the excess rather than letting the pump surge and the switch cycle.
The 60-80 PSI setting places this on higher-pressure equipment, so check that your pump and plumbing are built for that range before fitting it. A bypass set higher than the system is rated for never opens when it should; one set lower than the pump needs to reach means the pump can never build its working pressure. Confirm the part number against the parts breakdown for your pump.
Key Features
- Genuine Flojet (Xylem) service part — correct pressure setting and fit
- 60-80 PSI bypass setting for higher-pressure equipment
- Recirculates flow instead of letting the pump work against a dead end
- Smooths delivery and reduces pressure switch cycling on partly open outlets
- Protects the motor from stalling against full discharge pressure
Applications
- Flojet high-pressure systems specifying a 60-80 PSI bypass
- Spray and washdown equipment with a trigger or partly open outlets
- Systems with several outlets where the last one may be closed suddenly
- Restoring bypass function on a pump that surges or cycles
- Marine, dockside and mobile high-pressure installations
Specifications
- Brand: Flojet (Xylem)
- Manufacturer Part Number: 20378-003
- Part Type: Bypass kit
- Pressure Setting: 60-80 PSI
- Function: Recirculates flow once the set pressure is reached
- Condition: New
Frequently Asked Questions
Q: What is the difference between a bypass and a pressure switch?
The bypass is mechanical and relieves pressure by recirculating flow; the switch is electrical and stops the motor. Many systems use both, doing different jobs.
Q: Will a bypass stop the pump cycling on a spray gun?
It greatly reduces it. With a bypass fitted, briefly releasing the trigger recirculates flow rather than immediately spiking the pressure and toggling the switch.
Q: Does recirculating flow heat the water?
Over long periods of continuous bypass, yes, a little. It is not usually significant in intermittent use, but a pump left bypassing for hours will warm what it is circulating.
Q: What if the bypass setting is wrong for my pump?
Too high and it never opens, leaving the pump to work against a dead end. Too low and the pump can never reach its intended working pressure. Match it to the system.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct part before you order.
CLRMarine
