Tap back-nuts

[Grandad455]

Hi All, My first post, although I have been reading a lot on here and finding it most helpful. I have been tasked with making a pair of brass bath taps usable. They are an obsolete size, 7/8"BSP tails. Sadly whoever salvaged them forgot to save the back-nuts, with out which they are useless. I have managed to concoct a pair of tap connectors to adapt for 22mm copper pipe and could make a pair of back-nuts, but would have to purchase a set of taps and a die in 7/8"BSP to do so, at enormous expense. Has anybody any 7/8" BSP back-nuts hiding in a scrap box?

 

[Spectric]

That size is used in irrigation systems in horticulture and for tap connectors. Maybe you could convert something like this

https://www.easy-irrigation.co.uk/g...emale-p-1699?zenid=t88mrt8p9vvv89tcojrmkgg882
by silver / soft soldering a more common compression fitting onto it, would be easier if you had access to a small lathe.

 

[Phill05]

Hi Grandad, I remember seeing a pair not so long ago so been found them then dam it they are 3/4.

 

[Grandad455]

That size is used in irrigation systems in horticulture and for tap connectors. Maybe you could convert something like this

https://www.easy-irrigation.co.uk/g...emale-p-1699?zenid=t88mrt8p9vvv89tcojrmkgg882
by silver / soft soldering a more common compression fitting onto it, would be easier if you had access to a small lathe.

Thanks for your interest. Have already found hose fitting to modify for tap connector, but without back-nuts, not a lot of use.

 

[Grandad455]

Hi Grandad, I remember seeing a pair not so long ago so been found them then dam it they are 3/4.

View attachment 153295

View attachment 153296

Hi Grandad, I remember seeing a pair not so long ago so been found them then dam it they are 3/4.

View attachment 153295

View attachment 153296

Thanks for looking. 3/4 back-nuts are too small to enlarge to 7/8 thread and 1" ones can't get a bush to fit. Have thought about casting my own blanks if nothing else turns up.

 

[ChaiLatte]

One of these:

https://www.lsengineers.co.uk/7-8bsp-fem-brass-cap-to-3-4-tail.html
Cut off the flange that retains the hose tail. Shorten the two projecting lugs if necessary so you can rotate it under the bath. Make your own spanner out of a bit of pipe with two notches cut into it.

https://www.smartercomponents.co.uk/product/union-nut-7-8-bsp/https://www.thehosemaster.co.uk/female-bspt-locknuthttps://www.zoro.co.uk/shop/fasteners/lock-nuts/7-8-bsp-locknut-brass/p/ZT1267555Phttps://www.flowtech.co.uk/category...le-locknut/?sku=M325-74261&variantSku=UP12-78https://www.fluidairfittings.co.uk/products/air-pro-up12-78?variant=42889948954869
And to save you cobbling something together to connect to 3/4 BSP, one of these:

https://www.plumbnation.co.uk/site/brass-tap-tail-extensions/

 

[Grandad455]

One of these:

https://www.lsengineers.co.uk/7-8bsp-fem-brass-cap-to-3-4-tail.html
Cut off the flange that retains the hose tail. Shorten the two projecting lugs if necessary so you can rotate it under the bath. Make your own spanner out of a bit of pipe with two notches cut into it.

https://www.smartercomponents.co.uk/product/union-nut-7-8-bsp/https://www.thehosemaster.co.uk/female-bspt-locknuthttps://www.zoro.co.uk/shop/fasteners/lock-nuts/7-8-bsp-locknut-brass/p/ZT1267555Phttps://www.flowtech.co.uk/category...le-locknut/?sku=M325-74261&variantSku=UP12-78https://www.fluidairfittings.co.uk/products/air-pro-up12-78?variant=42889948954869
And to save you cobbling something together to connect to 3/4 BSP, one of these:

https://www.plumbnation.co.uk/site/brass-tap-tail-extensions/

Hi,
Have got a similar hose connector locally, almost half the price. That will be used with a 22mm straight compression connector to make the tap connector. The back nuts are a good idea, but the back-nuts needed for the taps need a big enough flange to hold the taps in place in the bath. I am now going to turn down a pair of the hose connectors and bore out a pair of 1 1/4" BSP flanged back-nuts to sweat the hose connectors in.to, which will give me the 7/8 back-nuts I need. Hope to post pictures at a later date.
Thanks for your input.
Regards, Grandad455

 

[Spectric]

but the back-nuts needed for the taps need a big enough flange to hold the taps in place in the bath

Backnuts with the flange are used to make working in awkward locations easier, but nothing wrong with a washer to spread the load and hold it on the bath just that it is two items to get in place.

 

[KeenToLearn]

Theres no pic but 7/8 BSP backnut available here, that size used in boilers: DHS Spares, buy now at dhsspares.co.uk