Welcome to The Spa Shop!
Aqua-Flo Circ Master barrel union O'ring.
O'ring is approximately 58mm in diameter and 3.5mm in thickness.
These O'rings do not suit different model pump 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
O'RING: Davey/Spa-Quip 40mm Union