A large service kit for the Hill MK3 pump includes a piston seal and all other replaceable seals. A classic symptom of high-pressure seal damage is piston stroke resistance. To extend the life of the seal, we recommend using only high-quality silicone petroleum jelly for lubrication and pumping slowly with 15-minute breaks after every 40 pumps. Attention, the kit does not fit the Hill MK4 pump.
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