For 3/4" valve, the price of these tiny washers seem to be going for anything between £6.50 - £10+,
Is it not £1.05 for 2 from toolstation?
For 3/4" valve, the price of these tiny washers seem to be going for anything between £6.50 - £10+,

Yes.Is it not £1.05 for 2 from toolstation?
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".Yup. For 3/4" valve,
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".
Is it not £1.05 for 2 from toolstation?
What is the OD of the threaded part through the tank wall?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.
We decided to install the new PART2 valve when it arrives.What is the OD of the threaded part through the tank wall?
What's the OD? That will settle whether it is 1/2" or 3/4".We decided to install the new PART2 valve when it arrives.
Will be taking out the old valve and just store it in the shed for repair through time.
They look like for 1/2" valves which are more common. The one we have is definitely 3/4" valve.
It's 1/2 inch BSP...my fifty years tells me that. A 3/4 inch would have a bigger float.What's the OD? That will settle whether it is 1/2" or 3/4".
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local