Eastman Dielectric Heat Trap Nipples 3" Pair — 3/4" MIP, Galvanized with Teflon-Lined Flapper

Eastman dielectric heat trap nipples are a pair of 3-inch, 3/4" MIP fittings—one blue and one red—engineered to reduce standby heat loss on water heater inlet and outlet connections.

These two heat-trap nipples provide a straightforward way to add a thermal-sealing barrier to a residential water heater without changing piping layouts. Built with galvanized bodies, Teflon-lined internals and a one-way flapper design, they help limit warm water from drifting back into supply lines when the heater isn’t actively circulating water. The color-coded pair (blue for cold, red for hot) makes installation intuitive and speeds up identification for service or replacement.

How do these heat trap nipples reduce heat loss?

Each nipple contains a flapper-style valve that closes when water movement stops, creating a partial thermal break at the connection point. This reduces convection and the amount of hot water that migrates into the cold inlet line or out of the tank through the outlet.

• Flapper valve blocks passive flow when system is idle
• Teflon lining minimizes friction and helps the flapper seal cleanly
• Galvanized exterior reduces surface heat transfer and resists corrosion

Will these fit my water heater and plumbing setup?

They are made with a 3/4" male inlet pipe (MIP) thread, which is a common size for many residential water heaters and supply lines—confirm your tank and pipe thread dimensions before ordering. At 3 inches long, the nipples provide enough length for secure threading while remaining compact for tight installation spaces.

• 3/4" MIP threads match standard residential heater connections
• 3" overall length suits most inlet/outlet fittings without extra piping
• Color coding simplifies correct hot and cold placement

How durable and maintenance-friendly are these fittings?

Eastman manufactured these nipples with corrosion resistance and ease-of-service in mind. The galvanized exterior helps protect against rust, while the Teflon internal lining resists wear and keeps the flapper operating smoothly. Because the fittings are self-cleaning in operation, they typically require little to no routine maintenance.

• Galvanized finish guards against external corrosion
• Teflon lining reduces internal wear and buildup
• Self-cleaning flapper lowers maintenance needs and improves reliability

How simple is the installation process for a DIYer or plumber?

Installation is straightforward for anyone comfortable with basic plumbing: shut off water, drain the tank below the connection point, remove existing nipples or fittings, then thread the Eastman nipples onto the inlet and outlet. Use appropriate pipe sealant or tape and tighten to manufacturer torque recommendations for a leak-free seal.

• Turn off and drain water heater before beginning
• Thread onto 3/4" MIP connections with pipe sealant or tape
• Color-coded pair prevents reversed hookup and speeds installation

Who is this for? Homeowners, plumbers, and building maintenance professionals looking for a low-cost retrofit to reduce standby heat migration from storage water heaters will find this Eastman pair useful. They’re ideal for retrofit projects, new installations where compact connections are required, and anyone who prefers color-coded parts for faster service. These nipples are not a replacement for system upgrades like insulation or tankless conversions, but they are a simple, durable component for improving the thermal performance of conventional water heaters.