Large service kit for Hill MK4 pumps includes piston seals and other all 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 set is not intended for MK1, MK2 and MK3 pumps, but only for the MK4 model.
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