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Davey Spa-Quip 50mm union O'ring.
O'ring is approximately 69mm in diameter and 5mm in thickness.
This O'ring is used on the pump and heater unions.
Balboa/Gecko 50mm Heater Union O'ring
Series 1000 Filter Lid O'Ring
O'RING: Aqua-Flo XP2/XP2e Pump Union
O'RING: Davey/Spa-Quip 40mm Union
Q'RING: Davey QB Pump Union