These heating pump valve nuts are designed a special way to allow them to be separated from their valve. If you have damaged your original nuts, you should be able to replace them with these, without having to remove / replace the pump valve.
This nut has a 1-1/2 inch BSP Thread (standard size for domestic central heating circulating pumps) - look at the BSPT link at the bottom of this page for information on plumbing thread sizes.
You can save money on this item when you purchase several at a time. The table below shows the minimum quantities required to benefit from this offer, and how much they'll cost.
||Price per unit