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I managed to try the 3/4 reducer but unfortunately its to small and falls straight through the hole. I managed a work around using the following items. 1 x 25mm-20mm pvc reducer Wiska 25mm to 20mm Reducer - Black 1 x 25mm brass female bush 25mm Brass Female Bush 1 x 20mm stuffing gland...

Ok will do.

Not sure if they are BSP, Sorry. I think i have some in my lockup i can grab one over the weekend and check for you, if your not in a hurry.

You could fit a 3/4 to 20mm adaptor then fit a smaller 20mm stuffing gland. ¾ Inch Male to 20mm Female Adaptors