Cut into existing 50mm waste pipe

[mike42]

I couldn't find any purpose made slip couplings so I was wondering if it would be reasonable to file down the stop of a regular solvent weld coupler?

 

[just pumps]

Sure is, just mark the pipes so you know where it goes.

 

[Nige F]

You're going to have to be quick - and wear gloves - and hope the solvent doesn't grab. Put plenty on both socket and pipe

 

[just pumps]

You're going to have to be quick - and wear gloves - and hope the solvent doesn't grab. Put plenty on both socket and pipe

Hence marking the pipe so you know where the coupler has to be. Would advise the cleaner is used on both the coupler and the pipes. OR if it is out of sight then use a rubber coupling

https://www.plastics-express.co.uk/flexible-couplings/fernco?product_id=2362

 

[Gasguru]

Or use a compression slip coupler..