{"product_id":"pentair-5-black-rotor-shaft-o-ring","title":"Pentair .5\" Black Rotor Shaft O-Ring","description":"\u003cp\u003eThe Pentair 0.5\" Black Multiport Valve Rotor Shaft O-Ring (Product #: 272421) is a factory-original OEM replacement elastomeric sealing element engineered to eliminate pressure-side water weeping and external air intrusion along the main control stem of pool and spa filtration networks. Specifically designed to seat securely within a precision-machined internal groove on the vertical central shaft of Pentair, Purex, and PacFab SM and SMBW series side-mounted diatomaceous earth (D.E.) separation valves—as well as select 1.5-inch and 2-inch top-mount multiport backwash configurations—this small yet critical ring forms a tight, dynamic mechanical barrier. When an operator depresses and rotates the external manual handle to index between filtration cycles (such as Filter, Backwash, Rinse, or Waste), the o-ring maintains an airtight seal against the inner walls of the valve dome cover while transitioning smoothly under heavy internal hydraulic loads. Molded from a premium-grade synthetic rubber compound featuring a 70-durometer hardness rating, this black elastomeric seal delivers exceptional dimensional compression memory and low-surface-friction resilience, allowing it to withstand continuous system line operating pressures up to 50 PSI. The rugged compound provides total immunity to structural dry-rotting, extreme pump room heat, and concentrated pool sanitizers like chlorine shock, muriatic acid, and advanced salt-chlorine generation. The physical dry weight of this single Pentair 0.5\" Black Rotor Shaft O-Ring is approximately \u003cb data-path-to-node=\"0\" data-index-in-node=\"1552\"\u003e0.005 pounds\u003c\/b\u003e (roughly 0.08 ounces, with a nominal packaged envelope shipping weight of 0.05 pounds), offering a lightweight, crucial hardware standard to preserve hydraulic pressure efficiency and prevent dynamic fluid leaks.\u003c\/p\u003e\n\u003cp data-path-to-node=\"1\"\u003e \u003c\/p\u003e","brand":"Commercial Pool and Spa Supplies","offers":[{"title":"Default Title","offer_id":53180527411311,"sku":"JV18","price":1.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/3785\/3807\/files\/images_7_2e235940-c2b1-4d48-a8aa-daf02accf199.jpg?v=1780417853","url":"https:\/\/commercialpoolandspasupplies.com\/products\/pentair-5-black-rotor-shaft-o-ring","provider":"Commercial Pool and Spa Supplies ","version":"1.0","type":"link"}