Heat Trap Nipple For Water Heater Anode

The "heattrap nipple" used for water heater anode rods is a short threaded adapter installed at the cold/hot water inlets/outlets of storage-type water heaters (commonly 3/4″ NPT). It features an internal plastic/polymer dielectric liner and often incorporates a flapper/ball-style check mechanism to block thermosiphon backflow during standby, reducing heat loss from the tank. Simultaneously, the liner electrically isolates brass/copper fittings from the steel tank/galvanized components, minimizing galvanic corrosion risk while aiding sealing and alignment during installation.

KEY FEATURES

• Corrosion protection
• Energy savings
• Dielectric isolation
• Easy installation
• Code compliant

SPECIFICATIONS

• Connection Thread:3/4″ NPT
• Overall Length:2-1/2″ or 3″
• Outer Diameter:1″- 1-3/8″
• Inner Diameter:1/2″ - 5/8″
• Body Material:Zinc-Plated Carbon Steel
• Dielectric Liner:Polypropylene (PP) / PEX Shield / Thermoplastic injection-molded sleeve, thickness ~1-2 mm
• Heat Trap Mechanism:Internal Flapper Valve or Ball-Type Check; Directional (Color-coded: Blue = Cold Inlet, Red = Hot Outlet)
• Pressure/Temp Rating:250 psi @ 180 °F (≈ 1.7 MPa @ 82 °C)
• Sealing Method:Thread sealant tape (PTFE) or anaerobic thread sealant

APPLICATIONS

• Residential storage water heaters
• Commercial water heaters
• Routine maintenance
• New construction/retrofits