What size tap is this?

[Simon373]

Hi, I am trying to fit a hosepipe to this tap (photo attached). I bought a 3/4 female adapter which is too big for the tap. I tried a 1/2 adapter too (shown on photo) but it is a fraction too small for the tap. Any advice welcome! Thanks

 

[moonlight]

Hi, I am trying to fit a hosepipe to this tap (photo attached). I bought a 3/4 female adapter which is too big for the tap. I tried a 1/2 adapter too (shown on photo) but it is a fraction too small for the tap. Any advice welcome! Thanks

Do you have a picture of the tap?

 

[Simon373]

Here’s a photo of the whole tap

 

[ShaunCorbs]

I would say best to change the tap to a modern one then your hose will fit

 

[moonlight]

Here’s a photo of the whole tap

It not a tap I recognise. I don't know if any one else will come up with the correct fitting. Might be worth considering changing the tap?

 

[snowhead]

It's 5/8", common on older bib taps.
Sometimes in the multifit plastic adapter kits you get one.
It's easier to change to a new tap.

Or there's this

5/8" x 3/4" x 1/2" Adaptor for Outside Tap Garden Hose Connector | Old x New | eBay

<p>Both ends have a male 3/4 inch BSP outer thread. One end has a 1/2 inch BSP female inner thread, the other a (rare) 5/8 inch BSP female inner thread, sometimes found on old outside taps.</p> <p>Use this brass adaptor fitting to allow connection of modern 3/4 inch Hozelock / Gardena type...

www.ebay.co.uk

 

[steadyon]

1. If your measurement of the diameter is 13/16", that equates to 20.6 mm. The outside diameter of a 1/2" BSP (parallel) thread is 20.8 mm, so I suspect the thread is 1/2" BSP.
2. Are you sure that plastic adaptor you are trying to fit is 1/2" BSP? If not try it with something known, like a 1/2" blanking cap, such as Screwfix 51939.
3. Or change the tap as suggested above.