Pentair 6" THS and 5S30-40 PVC Fiberloc™ Collar

The Pentair 6" Fiberloc™ Plumbing Collar (part number B4897) is a heavy-duty internal and external pressure-retaining connection component engineered exclusively for large-scale commercial water treatment infrastructure. This genuine original equipment manufacturer (OEM) structural fitting is designed explicitly to anchor the massive 6-inch high-capacity plumbing lines on the Pentair THS Series horizontal sand filters (such as the THS4272 configuration) and Pentair 5S30 to 5S40 Series Fiberloc commercial high-rate sand filtration networks.

Precision-molded from a thick-walled, commercial-grade PVC or high-impact composite matrix, this large-diameter collar serves as the mechanical coupling that secures the primary 6-inch flanged pipe connections to the internal distribution manifolds or bulkhead faces of the filter tank. Its primary operational role is to ensure an absolute, pressure-resistant, and leak-free union capable of facilitating massive commercial flow rates (frequently exceeding 290 GPM) without risking structural joint failure or alignment shifts under extreme system pressure variables.

When clamped or threaded tightly into position over matching high-density elastomeric gaskets, the collar distributes uniform mechanical compression around the plumbing seam. This eliminates localized structural stresses, absorbing severe pump startup thrusts and intense hydraulic vibration surges while allowing the pressurized filter vessel to safely handle continuous system operating metrics up to 50 PSI. Engineered to endure decades inside demanding commercial equipment pads, its robust PVC construction is highly resistant to structural cracking, warping, and advanced chemical oxidation or bleaching from constant exposure to high-strength sanitizers like liquid chlorine, bromine, ozone systems, and aggressive seasonal scale-removing acid washes. Due to its thick-gauge industrial reinforcement walls and wide-profile 6-inch diameter footprint, this replacement commercial filter collar carries a net product and shipping weight of approximately 0.85 to 1.30 pounds (about 13.6 to 20.8 ounces).