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Kinetico DO Cap Seal – Part No. 8628
Maintain a Leak-Free, Efficient Kinetico System
The Kinetico DO Cap Seal (Part No. 8628) is a vital replacement O-ring designed to ensure a watertight seal beneath the Discharge Outlet (DO) cap on many Kinetico water softeners. This precision-made seal prevents internal and external leaks, helping your softener maintain optimum performance and reliability.
Key Benefits
✅ Prevents Water Leaks – Seals the DO cap securely to stop drips or weeping from the control head. ✅ Maintains System Pressure – Ensures consistent flow during service and regeneration cycles. ✅ Improves Efficiency – Prevents air ingress and bypass, keeping your softener working as designed. ✅ Durable Construction – Manufactured from high-grade elastomer for long-term chlorine resistance. ✅ Simple Replacement – Easy to fit during regular servicing or rebuild of the valve head.
When to Replace
Replace the DO Cap Seal whenever:
You notice water seeping from around the DO cap
The softener fails to build pressure or leaks to drain
You are servicing or rebuilding your Kinetico valve (recommended every 5–10 years)
Installation Advice
Clean the DO cap and mating surface before fitting the new seal.
Apply a thin layer of food-grade silicone grease (do not use petroleum jelly).
Seat the O-ring evenly to avoid twisting or pinching.
Compatible Kinetico Models
The Kinetico DO Cap Seal (8628) is used in a wide range of twin-tank systems fitted with the 2020C-series and Mach control valves, including:
Kinetico 2020C / 2025C / 2030C
Kinetico Mach 2020C / Mach 2020HE
Kinetico 2060C / 2060s
Kinetico 2175C / 2178C
Kinetico Compact 2020 / 2020B
Early Kinetico Plus softeners
💡 Not compatible with newer Kinetico Premier Compact, AquaBlu, K5, or K2 systems.
The Kinetico DO Cap Seal (Part No. 8628) is a vital replacement O-ring designed to ensure a watertight seal beneath the Discharge Outlet (DO) cap on many Kinetico water softeners. This precision-made seal prevents internal and external leaks, helping your softener maintain optimum performance and reliability.
Key Benefits
✅ Prevents Water Leaks – Seals the DO cap securely to stop drips or weeping from the control head. ✅ Maintains System Pressure – Ensures consistent flow during service and regeneration cycles. ✅ Improves Efficiency – Prevents air ingress and bypass, keeping your softener working as designed. ✅ Durable Construction – Manufactured from high-grade elastomer for long-term chlorine resistance. ✅ Simple Replacement – Easy to fit during regular servicing or rebuild of the valve head.
When to Replace
Replace the DO Cap Seal whenever:
You notice water seeping from around the DO cap
The softener fails to build pressure or leaks to drain
You are servicing or rebuilding your Kinetico valve (recommended every 5–10 years)
Installation Advice
Clean the DO cap and mating surface before fitting the new seal.
Apply a thin layer of food-grade silicone grease (do not use petroleum jelly).
Seat the O-ring evenly to avoid twisting or pinching.
Compatible Kinetico Models
The Kinetico DO Cap Seal (8628) is used in a wide range of twin-tank systems fitted with the 2020C-series and Mach control valves, including:
Kinetico 2020C / 2025C / 2030C
Kinetico Mach 2020C / Mach 2020HE
Kinetico 2060C / 2060s
Kinetico 2175C / 2178C
Kinetico Compact 2020 / 2020B
Early Kinetico Plus softeners
💡 Not compatible with newer Kinetico Premier Compact, AquaBlu, K5, or K2 systems.
