The Jabsco 20407840 is a genuine Jabsco check valve kit with EPDM valves for Jabsco diaphragm pumps. The check valves open and close with every stroke of the diaphragm, letting liquid in on the suction stroke and out on the discharge stroke while stopping it from flowing backward.
When valves wear, harden or trap debris, the pump loses its ability to build pressure, cycles on and off, or runs without moving much liquid. EPDM is well suited to water and many water-based solutions, and replacing the valves restores tight sealing and full pumping performance.
Key Features
- Genuine Jabsco check valve kit
- EPDM valve material suited to water service
- Restores pressure and stops back-flow and rapid cycling
- Simple repair that often revives a weak diaphragm pump
- Direct replacement for the original valves
Applications
- Jabsco diaphragm pumps that list part 20407840
- Fresh water system and washdown pumps
- Pumps that cycle on and off with no taps open
- Routine diaphragm pump service
Specifications
- Part Number: 20407840
- Part Type: Check valve kit
- Valve Material: EPDM
- Brand: Jabsco
- Pump Type: Diaphragm pump
Frequently Asked Questions
Q: Why does my pump turn on when no taps are open?
Worn or dirty check valves let pressure bleed back through the pump, so it restarts to recover. Replacing the valve kit usually fixes this.
Q: Is EPDM right for my liquid?
EPDM is a good choice for water and many water-based liquids. It is not suited to oils or fuels, which call for a different valve material.
Q: Can debris cause valve problems?
Yes. A small particle can hold a valve open. An inlet strainer ahead of the pump helps protect the valves.
Q: Should the diaphragm be checked during the valve change?
Yes. The pump is already open, so inspect the diaphragm for cracks or stiffness and replace it if needed.
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 check valve kit.
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