Pentair SD80 Standpipe Assembly

The Pentair SD80 Standpipe Assembly (part number 152226 or 152238 depending on the plumbing diameter configuration) is a vital internal plumbing backbone engineered exclusively for the 26-inch tank Pentair Sand Dollar SD80 and Sta-Rite Cristal-Flo II top-mount pool and spa sand filtration systems. Injection-molded from heavy-walled, high-impact PVC and ABS thermoplastic composites, this rigid 26-inch vertical standpipe column functions as the primary conduit for circulating water within the pressure vessel. Its structural role is to connect the top-mounted multiport backwash valve directly to the lateral collector hub arrangement at the very base of the filter shell, ensuring that high-velocity water is seamlessly transported through the core of the system without disturbing the surrounding sand bed. Built to withstand continuous internal hydraulic pressures up to 50 PSI, forceful backwashing flow reversals, and a relentless downward load from up to 350 pounds of dense silica sand or glass media, this assembly features reinforced joints to prevent cracking or internal bypass leaks. Because it consists of a long, robust plastic pipe pre-fitted with heavy-duty connection couplers, the complete center standpipe assembly carries an individual product and shipping weight of approximately 2.20 pounds (about 35.2 ounces).