If your CAT Pump pressure washer pump is leaking water, losing pressure, or you’re noticing a general performance decrease, it’s time to check your seals! Seals act like gaskets – they prevent leaks. While CAT Pump seals are built to last, it’s important to check and evaluate your pumps every 1500 operating hours. When your seals begin to wear out, grab this CAT Pumps 30623 repair seal kit – it works on all CAT Pumps 5 frame plunger models, but please consult your pump manual to confirm compatibility with these NBR seals. One kit is required per pump. Made of durable NBR (medium nitrite Buna-N) rubber Can handle temperatures up to 160° F High and low pressure seals go in front and behind the seal case