Pentair 21" and 25" Lower Tank Fitting

The Pentair 21" and 25" Lower Tank Fitting (Part #24900-0500 / 24900-0500Z) is a specialized plumbing adapter engineered specifically for the lower bodies of Sta-Rite System 3 pool and spa filtration systems, including the 21-inch and 25-inch SS-Series Sand Filters. Constructed from heavy-walled, high-impact PVC, this critical interface component anchors directly into the basin shell to connect external multi-port valves or backwash lines to the filter's internal collection grid. Featuring a standard 1/2" National Pipe Taper (NPT) mechanical connection, it forms an unwavering, watertight seal designed to resist the constant expanding and contracting forces of pool pump filtration cycles, preventing localized high-pressure leaks at the vessel's primary exit point.

Because it is a single, dense piece of injection-molded PVC plumbing hardware, it remains relatively light yet structurally rigid:

• Actual Product Weight: Approximately 0.88 pounds (roughly 14.1 ounces).

• Packaged Shipping Weight: Typically scales at 1.1 to 1.3 pounds depending on the standard protective box materials used for transit.