- Genuine Hill Pumps replacement kit for the MK5 PCP hand pump's non-return valve
- Includes the valve, spring, O-ring and additional seals
- Allen key included for fitting
- Restores the pump's one-way airflow system, preventing backflow and pressure loss during a fill
- Fixes harder pumping and reduced sealing caused by a worn valve
- Part number Z5128-250, fits the MK5 pump only
- Genuine UK-made part from Hill Pumps of Sheffield
The Hill MK5 Non-Return Valve Kit is the genuine replacement parts set for the one-way valve inside the Hill MK5 PCP hand pump, the UK-made stirrup pump used to hand-fill PCP air rifles and HPA bottles. The non-return valve lets air flow from the pump into your cylinder while stopping it flowing back, and it is a critical part of the pump's internal mechanism - as it wears, sealing efficiency drops, pumping gets harder and pressure can be lost during a fill. This kit supplies the valve itself along with its spring, O-ring and additional seals, plus the Allen key needed to fit them, giving you everything required to restore the one-way airflow system in one go rather than sourcing parts individually. Part number Z5128-250, and this kit is for the MK5 pump only; check your pump model before ordering, as earlier Hill pumps use different valve parts. A genuine part from Hill Pumps of Sheffield, manufacturers of pumps and lubrication equipment since 1841.
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