Ao Smith 100109621 Pipe Nipple with Heat Traps 2-pack

Product Description

The AO SMITH 100109621 is a 3/4-inch x 5-inch pipe nipple assembly with integrated heat traps, sold as a pack of two. Heat traps are passive valves built into the nipple fittings that reduce standby heat loss by preventing thermosyphon circulation when the water heater is not actively drawing hot water. This makes them a functional component in water heater installations where energy efficiency and proper plumbing connection are required. Licensed plumbers and water heater service technicians install this part during new water heater installations or as a direct replacement on existing units.

This pipe nipple assembly is designed for residential water heater applications in heating systems. The heat trap nipples connect at the inlet and outlet ports of a storage-type water heater tank, helping to maintain stored water temperature and reduce unnecessary energy consumption between draw cycles. The pack of two provides both the hot and cold side nipples needed for a complete installation.

Key Features

• Integrated heat traps reduce standby heat loss by blocking thermosyphon flow
• 3/4-inch diameter x 5-inch length fits standard water heater tank port connections
• Sold as a pack of two, covering both inlet and outlet connections
• Direct OEM-style replacement for water heater service and repair
• Suitable for residential heating water heater applications

Compatibility

Designed as an OEM-style replacement pipe nipple assembly for residential storage-type water heaters requiring 3/4-inch heat trap nipple connections.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC guidelines. Shut off the water supply and disconnect power or gas to the water heater before removing or installing any plumbing connections. Use appropriate thread sealant or PTFE tape on all threaded joints and inspect for leaks after restoring service. Do not overtighten fittings, as this can damage the heat trap internals.

Technical Specifications

• Pipe Diameter: 0.75 inches
• Pipe Length: 5 inches
• Quantity per Pack: 2
• Application: Heating, Water Heater

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100109621