Plumbing help!

[Dinkydoos]

@pigletjohn
Or anyone else!
We are trying to redo our basin in the cloakroom.
We have a bottle trap from the sink with a 32mm chromed waste pipe. We were hoping to attached this to a push fit waste pipe but the push fit waste pipe is too big by three or four .millimetres even though it’s a new waste pipe. Is there something that we can buy to Marty these up - or do they do bottle traps in different sizes?
Any help hugely appreciated.

you mean the diameter of the pipe?

Post some photos please, including, especially, the pipe or fitting that you want to connect to.

How old is it?

where is the rubber sealing ring?

@pigletjohn
So sorry- kids tea getting sorted!
Anyway back to plumbing
Both the pipe and the bottle trap are brand new
The rubber sealing ring is in the compression joint in the bottle trap.

your connector is not a compresion, but a push-in. It fits plastic pipe of the same brand, and the size must be accurate.

A compression connector has a nut which pushes a cone against the rubber ring, and it compresses tightly against quite a range of size. You will be surprised how much, when you tighten it.

www.screwfix.com/p/mcalpine-ms4-bend-32mm/68742

note the big nuts. You can lube the threads and seals with white silicone plumbers grease if you can get it, or WUL with water on a paintbrush.

Tighten the nuts by hand, while wearing dry rubber gloves for grip.

p.s. some pipes are measured by internal diameter, and some by external. BSP iron pipes, and especially nuts, do not measure true to their description by either.

I've never checked, but probably the metal and the plastic pipes have the same internal diameter, so the thinner metal pipe is smaller externally. Measure it if you want.

btw a basin trap is 32mm, and a sink trap is 40mm.

@pigletjohn
Thanks - the end that fits in the bottle trap is compression I think. The outer nut pushes a cone against the rubber ring (with camber). What I want to fit it to on the other end is push fit but the pipe is 2-3mm narrower (external diameter) than the push fit will accept. I’ve read that I probably need a compression fit at the other end too?

what other end?

@PigletJohn
So sorry I just vanished- life took over!
Thanks for your help with this
We exchanged the bottle trap in the end - turns out the one we bought was non standard size so no wonder nothing would fit!
Thanks again for taking the time.