The 4018 O-Ring Kit is for 4000 PSI at 18GPM jetting units manufactured 2002 and later. The kit contains all of the o-rings, springs, and back up rings between the inlet and delivery manifold heads in the pump. This kit is usually required when:
- Pump is leaking between the two manifold heads or at the bolts (see thumbnail image for more detail)
- When your pump is less than 3 years or 700 hours old and is leaking.
Do not replace unless the pump is leaking as this is not a preventative maintenance tool. If your pump is 700 hours or older, it may require a Valve Kit instead which would replace more components within the pump.
