770140 O-RING COMBISET UNLOADERS

SKU: 4793

The 770140 o-ring combiset is a matched set of o-rings for servicing unloader valves — the small sealing rings that keep pressurized water inside the unloader body and out of the bypass and adjustment passages. O-rings in unloaders harden and flatten from heat and pressure cycling, and the result is external weeping or erratic unloader behavior. Replacing the full combiset during a rebuild is cheap insurance against chasing one leak after another. This is a part-number-specific set: confirm 770140 against your unloader's parts list or service diagram before ordering.