Hill Pumps MK5 Complete Piston Assembly Kit

• Genuine Hill Pumps replacement piston assembly for the MK5 PCP hand pump
• Includes one nickel-plated brass piston and one green piston seal
• Nickel plating adds extra durability and corrosion resistance over the standard piston
• The piston seal generates the airtight compression inside the pump barrel
• Restores full stroke efficiency and smooth pumping action as the original piston wears
• Part number Z5128-275, fits the MK5 pump only
• Genuine UK-made part from Hill Pumps of Sheffield

The Hill MK5 Piston Assembly Kit is the genuine replacement piston and seal for the Hill MK5 PCP hand pump, the UK-made stirrup pump used to hand-fill PCP air rifles and HPA bottles. The piston is the part that generates airtight compression on every stroke, and like any wearing component it eventually loses its seal, making the pump harder to work and slower to build pressure. This kit supplies one nickel-plated brass piston - plated for extra durability and corrosion resistance over the standard brass item - together with one green piston seal, the component responsible for the airtight fit inside the pump barrel. Fitting a fresh piston and seal restores full stroke efficiency and smooth, consistent pumping action. Part number Z5128-275, and this kit is for the MK5 pump only; check your pump model before ordering, as earlier Hill pumps use different piston assemblies. A genuine part from Hill Pumps of Sheffield, manufacturers of pumps and lubrication equipment since 1841.

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