{"product_id":"pentair-8-external-tooth-lockwasher-oem-u43-21ssz","title":"Pentair #8 External Tooth Lockwasher OEM | U43-21SSZ","description":"\u003ch2\u003ePentair #8 External Tooth Lockwasher OEM Pump Hardware | U43-21SSZ\u003c\/h2\u003e\n\u003cp\u003eOEM Pentair U43-21SSZ #8 external tooth lockwasher. Prevents loosening from vibration in Max-E-Pro, IntelliPro, and Dura-Glas pumps.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOEM Pentair replacement for secure fastening performance.\u003c\/li\u003e\n\u003cli\u003eExternal tooth design locks screws in place under vibration.\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant stainless steel for long service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe Pentair U43-21SSZ External Tooth Lockwasher (#8) is a genuine OEM fastening component designed to keep critical pump hardware secure under constant vibration. Its external tooth (star) design grips the mating surface, preventing screws from backing out and protecting internal pump assemblies from loosening over time.\u003c\/p\u003e\n\u003cp\u003eBuilt from corrosion-resistant stainless steel, this washer is engineered for long-term durability in harsh pool environments. It is commonly used across a wide range of Pentair and Sta-Rite pumps, including Max-E-Pro, IntelliPro, Dura-Glas, and Dyna series models.\u003c\/p\u003e\n\u003cp\u003eThis small but essential component plays a key role in maintaining pump stability, reducing vibration-related wear, and ensuring safe, reliable operation.\u003c\/p\u003e\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eWhen replacing pump screws or servicing the diffuser or seal plate, always install a new lockwasher—reusing worn washers can lead to loosening and premature failures.\u003c\/p\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cp\u003eDisconnect power before servicing. Replace washers during reassembly to ensure proper locking. Do not overtighten fasteners to avoid damaging components.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":42419714654293,"sku":"U43-21SSZ","price":10.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0105\/0837\/0005\/files\/photocomingsoon_797cd922-6ff3-473c-bd45-b5a17fa2f7f4.jpg?v=1763577635","url":"https:\/\/www.epoolsupply.com\/products\/pentair-8-external-tooth-lockwasher-oem-u43-21ssz","provider":"ePoolSupply","version":"1.0","type":"link"}