DISCONTINUED

This is the Pentair Universal Retention Tank Drain Assembly, a replacement service part originally supplied for retention-style treatment tanks. Please note that this item has been discontinued by the manufacturer. It is documented here for reference, for cross-matching older equipment, and for customers who already have one installed and simply need to confirm the part they are servicing. Knowing the original specification is often the first step toward sourcing a current-production equivalent, and a clear record of the fitting saves time when a technician is standing at the tank with a wrench in hand.

A retention tank drain assembly handles the lower-tank connection on contact and aeration vessels—the kind of tanks used to hold water long enough for oxidation, chlorine contact, or sediment settling to take place. The drain assembly provides a controlled outlet for flushing accumulated solids, draining the vessel for periodic maintenance, and clearing the bottom of the tank during routine cleaning. Because it sits at the base of a pressurized vessel, the integrity of this fitting genuinely matters: a sound drain assembly keeps the tank sealed while it's in service and lets a technician open it deliberately and safely whenever the system needs attention.

• Universal-style fit for common retention and contact tanks
• Bottom-drain function for flushing sediment and oxidized iron
• Used on chlorine-contact and aeration treatment setups
• Approximately 0.84 lb service-part weight
• Discontinued—listed for identification and cross-reference

If you are maintaining an older Pentair-equipped retention tank, identifying the original drain-assembly configuration helps you specify a compatible current part or rebuild the lower connection correctly the first time. Retention and contact tanks remain a workhorse of well-water treatment, particularly for iron, manganese, and hydrogen-sulfide problems where dissolved contaminants need oxidation dwell time before they can be filtered out. When you do service one of these systems, draining and inspecting the bottom of the tank is a routine and necessary step, so a reliable drain assembly is essential to keeping the system clean and the treated water clear. Over time, sediment and oxidized minerals settle into the base, and a periodic bottom flush prevents that buildup from channeling water or fouling downstream media. For current availability, consult an equivalent retention-tank drain fitting matched to your tank diameter and plumbing size, and verify the thread or socket pattern against the unit you are replacing before ordering.