Pentair 21" and 25" Relief Adapter Bushing

The Pentair 21" and 25" Relief Adapter Bushing (part number 154569) is a specialized internal plumbing fitting engineered for the automated air relief assemblies found within Pentair Triton II 21-inch (TR50) and 25-inch (TR60) side-mount sand filters, as well as select Tagelus top-mount sand filtration systems. Injection-molded from a heavy-duty, chemical-resistant polymer composite, this compact reduction bushing threads or snaps directly onto the top of the internal collector piping or standpipe assembly. Its primary structural role is to reduce the plumbing port size down to securely anchor the small-diameter air relief vinyl tubing, ensuring a tightly sealed connection that allows trapped air to be continually vented from the upper dome of the tank down into the return manifold. Built to withstand intense hydraulic pressure, constant turbulent underwater currents, and prolonged exposure to chlorinated pool water, this adapter bushing prevents structural shifting or air bypass failure inside the pressurized shell. Given its small, all-plastic construction, this hardware accessory is exceptionally lightweight, carrying an individual product and shipping weight of approximately 0.05 pounds (about 0.8 ounces).