Pentair 22.75" Collector Hub Assembly

The Pentair 22.75" Collector Hub Assembly (part number 152228, also classified as the 22.75-inch overall length SD40 tank piping assembly) is a vital internal hydraulics package engineered specifically for the 19-inch Pentair Sand Dollar SD40 and Sta-Rite Cristal-Flo II top-mount sand filtration systems. Injection-molded from heavy-walled, high-impact PVC and ABS thermoplastic composites, this integrated unit features a rigid vertical standpipe coupled directly to a multi-port lower collector hub. Its critical structural and operational role is to anchor at the exact floor of the filter tank beneath up to 150 pounds of dense silica sand, where it collects fully clarified water via attached slotted laterals and channels it safely upward through the central column to the top-mounted multiport backwash control valve. Designed to manage continuous internal hydraulic operating pressures up to 50 PSI and withstand intense water velocity shifts during routine backwash cycles, its reinforced polymer construction eliminates structural flexing and internal pressure bypass leaks. Because it combines a elongated, hollow vertical pipe with a dense lower manifold distribution hub, the complete pre-assembled system carries a manageable product and shipping weight of approximately 1.65 to 1.72 pounds (about 27 ounces).