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Davey Spa-Quip 40mm union O'ring.
O'ring is approximately 60mm in diameter and 4mm in thickness.
This O'ring is used on the pump and heater unions.
Balboa/Gecko 50mm Heater Union O'ring
O'RING: Davey/Spa-Quip 50mm Union
O'RING: Aqua-Flo XP2/XP2e Pump Union
Series 1000 Filter Lid O'Ring
Q'RING: Davey QB Pump Union