Small service kit for Hill MK3 pumps contains 3 seals including main high pressure. 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. Please note, the kit does not fit the Hill MK4 pump. Manufacturer number: Z4128-101.
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