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The A.O. SMITH 100108609 is a 52-inch PEX cross-linked polymer dip tube with gasket, designed for use in residential water heater tanks. The dip tube directs incoming cold water to the bottom of the tank, keeping cold and hot water stratified for efficient heating. Made from cross-linked PEX material, it offers superior resistance to thermal oxidation compared to standard polypropylene tubes, extending service life in demanding hot-water environments. This part is installed by licensed plumbers during routine water heater service or repair.
This dip tube is a direct replacement component for A.O. SMITH gas and electric water heater models. At 52 inches in length, it is suited for standard residential tank water heaters. It ships with a gasket, simplifying reinstallation and helping ensure a proper cold-water inlet seal. The replacement part classification makes it appropriate for service calls where the existing dip tube has degraded, broken, or caused sediment buildup in the tank.
Designed as an OEM-style replacement dip tube for A.O. SMITH gas and electric water heater models. Consult the water heater model documentation to confirm inlet connection sizing before installation.
Dip tube replacement is a plumbing service task typically performed by a licensed plumber. Shut off the cold-water supply and disconnect power or gas to the water heater before beginning work. Drain sufficient water from the tank to relieve pressure at the cold-water inlet port before removing the old tube. Inspect the inlet fitting threads for damage and seat the included gasket properly to prevent leaks upon reinstallation.
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