Valve cup and tip seal kit, H0-P4301 - Canarm

The Canarm H0-P4301 seal kit contains the internal rubber sealing components for the H0-P4300 fill valve:

• Cup seals — the internal seals that prevent water from bypassing the valve seat when the valve is closed. These are the most common wear items in the valve.
• Valve stem tip seal — seals the tip of the valve stem against the seat to stop flow when the float rises.

The seal kit allows you to rebuild the H0-P4300 valve rather than replacing the entire assembly — a more economical repair when the valve body and anti-siphon mechanism are still in good condition but the valve is dripping due to seal wear.

Seal service life in a Canarm fill valve depends primarily on water quality and usage frequency. General guidelines:

• High mineral content water (hard water): Seals can wear faster due to abrasive mineral particles and scale buildup. Inspect annually and replace every 2–3 years.
• Soft water / treated water: Seals can last 4–6 years or longer with proper winterization and annual cleaning.
• High-traffic waterers (100+ head): More frequent valve cycling accelerates wear. Inspect seals at each fall maintenance check.

The best indicator is performance: if the valve begins to drip despite cleaning, the seals have worn past their service life. Replacing seals proactively each fall during your annual waterer service is the most cost-effective approach — a dripping valve that freezes overnight can cause significant ice damage to the bowl and plumbing.