Hello,
Is the thread on a 15mm compression fitting 1/2 inch BSP? And on a
22mm fitting 3/4 inch?I ask because Screwfix sell male compression couples that have a 15mm nut on one side and a 1/2 inch male thread on the other. I wondered whether this is just a straight 15mm couple with one nut removed or are they different?
Similarly is a 22mm to 3/4 inch couple just a 2mm straight couple with one nut removed?
Thanks. Stephen.
Don't think so.
I think they are for connection to iron pipe or possibly to connect to tanks etc.
Someone will be along in a minute I'm sure...
A compression fitting has a internal taper for the olive. A male coupler not.
IME almost always yes.
No unfortunately, would be handy it it was.
A 15mm compression to 1/2 BSP male will have a flat on the threaded end to seal against a washer.
In a pinch where needing the above, I've used a 15mm compression coupler and sanded a flat on one side with medium/fine wet'n'dry paper.
cheers, Pete.
Sorry, I should have known that because 22mm and 3/4 inch fittings can be used together only with special olives, can't they.
I've got a few 15mm straight couplers so I was hoping to use them, rather than drive and buy something. The petrol would cost more than the part! I think in this case, I will get away with a straight couple.
A few years ago I bought some special olives - at a much greater price than standard olives - and found they were not special at all. So I took them back and used a special one I had in the meantime found down the back of the sofa (or similarly silly place). Company refused to accept there was a problem. Don't buy from Focus (I wouldn't normally but was the only place I could get to before shop closing on a Sunday afternoon)!
I think you will find that if you buy your olives from a genuine Italian grower that they are very special indeed.
But are they 22mm or 3/4" ? :-)
We'll be having none of that imperial stuff. We leave that to the Romans.
I'm surprised Focus stock something as exotic as 3/4 in olives!
If the fitting fits the screwed connection, then it should be OK. Use lots of PTFE Tape. Baz
But how do you write 3/4 in Roman?
Surely they must have used XXIImm? Or should that be XXIIMM?
0.LXXV uncia?
(Yes, I know there's a flaw in there somewhere...)
Or maybe they didn't have any pipework smaller than one digitus and microbore heating really only became popular in the MCMLXs.
Owain
Yes - hypocausts use pipes a wee bit bigger...
I used a few of these in my 1950's house. It was cheaper to use a 3/4 olive to couple up to some old low pressure (from gravity tank) pipework than replace with new 22mm pipe.
P.
When using a 15mm to 1/2 inch couple, such as Screwfix 12341, should a washer be used in the imperial side? I must confess I have always used lots of PTFE but never used a washer. Have I been doing it wrong?
I realise my OP was about male-male couples rather than these but even then, the male gets connected to something.
Thanks, Stephen.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.