The Hayward Valve O-Ring (GMX600F) is the OEM replacement sealing O-ring for the VariFlo and VariFlo XL multiport control valves fitted to Hayward ProSeries sand filters and MaxFlo pump models. IMPORTANT: LUBRICATION REQUIRED — SOLD SEPARATELYAlways lubricate this O-ring with a silicone-based lubricant before installation. Browse our Pool Plumbing Lubricants for a compatible silicone lubricant. This O-ring forms the pressure seal at its designated seating point within the multiport valve body, preventing water bypass and maintaining correct flow-path integrity during filtration, backwash, rinse, and waste cycles. Specifications Hayward Part Number GMX600F UPC 610377027151 Fits Into Brand Equipment Line Model / Part Number Hayward ProSeries 16" Sand Filter - Top Mount (VariFlo XL Control Valve Included) W3S166T Hayward ProSeries 18" Sand Filter - Top Mount (VariFlo XL Control Valve Included) W3S180T Hayward ProSeries 21" Sand Filter - Side Mount (1½" VariFlo Valve Included) W3S210S Hayward ProSeries 21" Sand Filter - Top Mount (VariFlo XL Control Valve Included) W3S210T Hayward ProSeries 22" Sand Filter - Top Mount (1½" VariFlo Valve Included) W3S220T Hayward ProSeries 24" Sand Filter - Top Mount (1½" VariFlo Valve Included) W3S244T Hayward ProSeries 24" Sand Filter - Top Mount (2" VariFlo Valve Included) W3S244T2 Hayward ProSeries 27" Sand Filter - Top Mount (1½" VariFlo Valve Included) W3S270T Hayward ProSeries 27" Sand Filter - Top Mount (2" VariFlo Valve Included) W3S270T2 Hayward ProSeries 30" Sand Filter - Side Mount (Valve Not Included) W3S310S Hayward ProSeries 30" Sand Filter - Top Mount (2" VariFlo Valve Included) W3S310T2 Hayward MaxFlo XL Pump, 1.25 HP W3SP2307X10 Hayward MaxFlo XE Ultra-High Efficiency Pump, 1.65 HP W3SP2310X15XE Hayward MaxFlo XL Pump, 2.25 HP W3SP2315X20 Hayward MaxFlo XE Ultra-High Efficiency Pump, 2.25 HP W3SP2315X20XE Hayward MaxFlo VS 415, 1.65 HP Pump w/ OmniX W3VSP23415 Hayward MaxFlo VS 420, 2.25 HP Pump w/ OmniX W3VSP23420 Compatibility is based on Hayward parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Poolaroo Pro Tip Before seating this O-ring, clean the groove thoroughly to remove any old rubber fragments or mineral deposits — even a small piece of debris can prevent a full seal and cause a leak to reappear immediately. Apply a thin, even coat of silicone-based lubricant to the O-ring before installation; never use petroleum-based products, which degrade rubber. Browse Pool Plumbing Lubricants for a compatible option.
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