Pentair 2000 and 4000 Series Holding Wheel Assembly Kit

The Pentair 2000 and 4000 Series Holding Wheel Assembly Kit (part number 071019Z) is an internal structural alignment and compression hardware kit engineered exclusively for classic, heavy-duty Diatomaceous Earth (D.E.) separation networks. This genuine original equipment manufacturer (OEM) replacement component is tailored specifically to reinforce the vertical core grids inside the legacy Purex / Pentair SM and SMBW 2000 and 4000 Series pool and spa D.E. filtration systems.

Injection-molded from a thick-walled, high-impact polymer composite that resists chemical stripping, this wheel-shaped compression plate functions as the central positioning stabilization ring for the multi-element internal assembly. Its primary operational role is to sit flush within the internal cluster, gripping and anchoring the inner edges of individual curved fabric filter sheets or element segments. When the main tie rods or retention bolts are tightened over it, the holding wheel compresses the internal elements evenly down against the lower manifold hub. This spatial anchoring isolates the filtration elements, keeping them perfectly upright and uniformly balanced to prevent overlapping, tilting, or collapsing under intense hydraulic loads. By maintaining a uniform radial gap between the media segments, it ensures an optimized water path across the entire D.E. powder bed, stopping loose earth from bypassing the filter membrane and returning to the pool.

Built to remain continuously submerged inside a highly volatile, high-pressure utility vessel, its heavy-duty composite formulation completely resists material distortion, environmental stress-cracking, and advanced bleaching from direct exposure to high-strength pool sanitizers like chlorine, bromine, and seasonal scale washes. Capable of helping the internal core safely handle massive circulation velocities and withstand continuous system operating pressures up to 50 PSI, this individual replacement holding wheel kit features a compact, sturdy plastic structural footprint with a net product and shipping weight of approximately 0.80 to 1.10 pounds (about 12.8 to 17.6 ounces).