What size tap?

[goodolpete]

Our allotments have standpipes with taps with an exterior thead:

The bottom of the tap is 3cm across.
Ive been looking for an attachment like the top metal bit here:

to screw on. Ive been to B and Q, Bunnings etc
and tried sizes 15mm 22mm 28mm 1/2 in 3/4 in 1inch. None of them fit.
Anyone any idea what size I need to buy?
Thanks In Advance,
GOP

[DannyK]

Tap has 3/4 inch on it. Have you tried Hozelock fitting?https://www.hozelock.com/our-product...tap-connector/

As far as I know GB taps still use imperial sized connections but can't remember if it's the inner or outer diameter.

[Guest]

If you are just trying to put the hose on then you need a bib tap/ outside tap nozzle but not many places do them separate so you end up buying the whole tap then you can lose all the gubbins off ya hose bar the jubilee clip.

I suspect the fitting on your hose doesn't have a standard thread and that is the issue rather than the size. Otherwise you could have used a socket and a nipple but it is still easier and neater to get the tap nozzle

[bikermike]

get a tap nozzle they are all (well they should be) BSP (British Standard Pipe Thread) - which is (IIRC) a taper fit.

I'd be surprised if a Hozelock connector doesn't fit. Is your hose from overseas?
Could you look at what other allotmenteers are using

[Lardman]

The standard outside tap thread is 25-26mm so if your tap is measuring 30mm Im going to hazard a guess its actually 33mm.

Hoselock do a 33.3mm tap quick fit adapter https://www.hozelock.com/our-product...tap-connector/ DannyK's link is for a standard size one.

Or are you specifically looking for an old style friction fit ?

[DannyK]

It's a shame that the old fashioned iron-monger and builders merchant where staff knew how their stock was used have disappeared. The last one in Croydon shut years ago. It wasn't cheap but if you told them what you wanted to do they'd come up with the goods. B&Q are pitiful. I once asked a staff member where dawn/dusk light switches were. He said he wasn't an electrician and walked off!

[goodolpete]

Thanks for your replies, the hozelock didn’t fit, so will look for a 33mm one or just one that fits!

[4Shoes]

I expect the tap in is similar to the one I have. It is connected to a 25mm Blue Water Pipe with a 3/4" Female fitting. The tap / hose connector has a fine thread and I was looking for a reducer to connect up a brass "isolation" splitter to run 2 hoses. I must have every combination of timer, reducer and hose clip.

I wasn't able to resolve the issue either and ended up using the same combination (flexible hose connector, jubilee clip and then the Hazelock pipe fitting) as shown in the lower picture. The issue with that is that the water flow is restricted.

I was thinking the tap it may be used for industrial hose connections, but not looked further.

If you do find a coupling, could you post a link.

[Lardman]

I expect the tap in is similar to the one I have. It is connected to a 25mm Blue Water Pipe with a 3/4" Female fitting.

If you do find a coupling, could you post a link.

Id suggest an accurate measurement of the threaded end and a quick visual on the thread pitch but this should work if it's the same as the OPs.

https://www.easy-irrigation.co.uk/ho...uj7fsrf2fshf26

Available from lots of places - even amazon.

[Potstubsdustbins]

That looks like a standard 1/2" Bsp hose union bib cock, if so you need a 3/4" Bsp hose union nut and tail available of the net for less than £3.

You may have tried 3/4"Bsp taper threads which you will have difficulty getting started as that thread is a parallel BSPP.

However I have to say you can get a complete new bib cock for well less that a tenner.

For others info there are still plenty of good plumbers merchants about you just have to know where to look.

[4Shoes]

Goodolpete - Can confirm I have similar tap - It does have an unusual thread size.

Taken a few photos


(Click on image for full screen)


Pictures left to Right - 33mm fitting, 33mm fitting placed over tap (space at back), Tap, Assembly as setup for hose. The Tap Connector Thread is approximately 30mm

I have the 3/4 version of

https://www.toolstation.com/shop/p32002

Only 1/2" tap is suitable for quick release fittings, which I have found this to be the case.The assemble I've cobbled together reduces the pressure and prevents 2nd hose being available and can't use my timers.

I tried local plumbers merchants - no luck and even sent PM to Amazon / ebay suppliers - all say find a good plumber merchant.

I did find one and if I was sure it was right converter would buy, but with the price and the postage nearly as cheap to get a 2nd 1/2" tap (that will work) until I can locate the appropriate coupling.


Edit - reworked text

[DannyK]

Try contacting these peoplehttps://www.waterirrigation.co.uk/ho...onnectors.html

[4Shoes]

Try contacting these peoplehttps://www.waterirrigation.co.uk/ho...onnectors.html

Thanks for the hint.... I expect it is a 7/8" fitting.

Wee bit of maths confirms this is approx. size. 33.3mm = 1"
33.3/8 x7 =29.13mm Approx size of thread on tap.

Made rookie error of looking at a 3/4 x 3/4 x 7/8 tap extension - that would be used when fitting a shower to extend pipes by 7/8"

Will have to contact them to see if they have a 7/8" x 3/4" reducer.

[DannyK]

Wee bit of maths confirms this is approx. size. 33.3mm = 1

NO!!!! 25.4mm=1"

[4Shoes]

NO!!!! 25.4mm=1"

[ATTACH=CONFIG]81976[/ATTACH]

BSP chart below



DannyK -
Thanks for your help yesterday... and yes 1" = 25.4mm.

We are talking pipe fitting and these are listed in the BSP chart.
From the chart a 1" fitting has a 33.3mm thread.

The thread measured on the tap is approximately 30mm. Using the BSP chart this is between the 3/4" and the 1".

The supplier link has an "odd fitting" - 7/8" Claw female. (GEKA)

https://www.waterirrigation.co.uk/ho...sp-female.html

All others fittings are listed on the BSP chart.

to confirm.. Using the 33.3mm as thread dia size for 1" fitting, a 7/8" fitting would have a thread dia of 29.13mm approx.


Looking at my tap thread is approx 30mm, and is finer thread than the 1" fitting.

So my thinking is that the 7/8 must still have a 14tpi giving us a none-common fitting entry of

7/8" 29.5mm (30mm?) 14 tpi

That is what I appear to have... and by looks of it what Goodolpete is looking for.

One option would be to use the fitting with a GEKA hose connection to get started.

https://www.waterirrigation.co.uk/pi..._list_limit=75

Not ideal, but as a longer tern investment, worth considering.