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The Eyeball screw out and the thread is 46.50mm ( OR 40mm BSP PVC Pressure fitting) the OD of the eyeball is 60mm The OD of the wall fitting is 88mm
This eye Ball pool return is 40mm or 32mm to take 38mm or 32mm spiral pool hose.
The hole size required in the pool wall is 60mm.
There is two gaskets, 1 60mm threaded locking nut,
The eye ball screws in to the body hole size is 40mm.