A very peculiar shaped ballvalve in the loft water tank

Are you sure it's 3/4" Looks like 1/2" to me, much more common in a house. The OD of the 1/2" BSP thread is 21.4 mm, 0.84".

Yes, the old valve has 3/4" fitting - bolt and nut through the water tank connecting to the Tee connector (3/4" in the centre). Not 22mm, not 15mm, not 1/2".
Search eBay for 3/4" ballvalve washers with no hole, and the price is between £6.50 - £10 each.
 
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Yes, the old valve has 3/4" fitting - bolt and nut through the water tank connecting to the Tee connector (3/4" in the centre). Not 22mm, not 15mm, not 1/2".
Search eBay for 3/4" ballvalve washers with no hole, and the price is between £6.50 - £10 each.
What is the OD of the threaded part through the tank wall?
 

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