The Pentair Admiral S20 Circular Weir with Equalizer (84420505) is the OEM replacement weir assembly for the Admiral S20 concrete pool skimmer, configured with a 2" slip equalizer port. NSF certified. IMPORTANT: VERIFY YOUR SKIMMER MODEL AND EQUALIZER PORT TYPE BEFORE ORDERINGThis weir assembly is specific to the Admiral S20 skimmer with a 2" slip equalizer connection. Confirm your skimmer model number and that your equalizer port accepts a slip fitting — not a threaded connection — before ordering. The circular weir floats at the water surface inside the skimmer throat, creating continuous skimming action that draws surface debris into the skimmer basket. The integrated equalizer fitting maintains water flow to the skimmer when pool water level drops, preventing the pump from drawing air. A deteriorated weir reduces surface skimming efficiency; a compromised equalizer fitting can introduce air entrainment at the pump. This replacement assembly restores both functions in a single part designed to the exact dimensions of the Admiral S20 housing. NSF certified for concrete pool construction. Specifications Pentair Part Number 84420505 Equipment Line Admiral S20 Skimmer Connection Type 2" Slip Construction For concrete pool construction Certifications NSF Certified Poolaroo Pro Tip Before ordering, locate the model number molded into the skimmer body — typically on the inside wall of the housing below the lid seat. Confirm it reads "S20." Also verify your equalizer port accepts a slip fitting; slip and threaded connections are not interchangeable and the wrong configuration will not seal correctly. When replacing the weir, inspect the equalizer check valve and skimmer basket at the same time — addressing these together while the skimmer is already accessible avoids a return visit.
