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The A.O. SMITH 100108856 is a 52-inch diffuser dip tube assembly used in water heater tanks. The dip tube routes incoming cold water to the bottom of the tank, allowing hot water to be drawn from the top without mixing. The diffuser end reduces turbulence at the inlet, which helps maintain stratification and improves heating efficiency. This part is installed by licensed plumbers or water heater service technicians as a direct replacement component during routine maintenance or after a tube failure is diagnosed.
This assembly is intended for use as a replacement part in water heater systems where the original dip tube has cracked, broken, or deteriorated. Dip tube failure is a common cause of reduced hot water output and discolored water. At 52 inches in length, this tube is sized for taller tank configurations. It is suited for residential or light commercial water heater service applications.
Designed as an OEM-style replacement dip tube assembly for compatible A.O. SMITH water heater tanks. Verify tank model and tube length requirements before installation.
Installation should be performed by a licensed plumber or qualified water heater technician. Shut off the cold water supply and disconnect power or gas to the water heater before beginning any service work. The dip tube is typically accessed by removing the cold water inlet fitting at the top of the tank. Follow all applicable local plumbing codes and manufacturer service documentation during replacement.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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