Waterway 711-4030 2″ Heater Tailpiece Gasket / O-Ring
Part # 711-4030 — a replacement 2″ heater union gasket designed to seal tailpiece connections on pool and spa heaters or plumbing unions. This gasket helps ensure a watertight seal preventing leaks at heater or pump tailpiece unions.
Key Features
- Designed for 2″ heater plumbing unions and tailpiece connections requiring a 2–1/8″ ID sealing surface.
- Constructed with a molded O-ring rib to provide a secure seal under pressure and plumbing stress.
- Flat-on-one-side, ribbed-on-the-other design for proper sealing seat between union parts.
- Chemical- and water-resistant material suitable for pool and spa heater environments.
- Compact gasket profile — easy to install without disassembly of major equipment.
Typical Applications
Used when a 2″ heater or pump union shows signs of leaking, water seepage, or pressure loss. Also recommended as a preventive maintenance part when servicing heater plumbing unions, tailpieces, or whenever the union is opened for cleaning or inspection.
Installation & Compatibility Notes
Before installation, turn off pump or heater and relieve all water pressure. Drain any remaining water from the union. Remove the old gasket and clean sealing surfaces thoroughly. Place the 711-4030 gasket inside the union body — flat face toward one side, ribbed face toward the mating tailpiece. Re-assemble the union, tighten evenly to manufacturer torque specs, and test for leaks under pressure.
Why Replace the Gasket?
Over time, gaskets can become brittle, compressed, or deformed — leading to leaks, loss of pressure, or water damage. Installing a fresh 711-4030 gasket restores proper sealing integrity and helps prevent leaks in heater or pump plumbing systems.
Maintenance Tips
- Inspect union gaskets annually — especially after winterizing or extended shutdown — and replace if hardened or deformed.
- Ensure sealing surfaces are clean, dry, and free of debris before installing the new gasket to avoid sealing issues.
- Avoid overtightening unions — snug and evenly tightened is usually sufficient to keep a seal without damaging the gasket.
- Keep a spare 711-4030 gasket on hand for fast repairs when unions need servicing or leaks appear.
