This elbow joint is leaking. I think it’s the condensation pipe off the boiler because it seems to leak when the boiler comes on. I’ve tightened it fully but still leaking.
The pipe on the left (white) measures 21.5mm and the grey pipe coming out of the waste pipe seems to measure 29mm
The angle is 90 degrees and it looks like a compression fitting, but i can’t seem to find this elbow joint anywhere
Extra details: This is located under the sink. The boiler is located to the left on the wall. This pipe comes out the bottom of the boiler. The big pipe in the middle going down is the waste pipe
Washer: Looks like a rubber tapered washer. Outside diameter about 28.6. Inside diameter 21.5 height 6.5
Conclusion Actually someone said to check the water isnt leaking from the white elbow joint and running down onto the grey nut.. once I checked it, it was obviously leaking from the white elbow joint, so I ended up sealing up the white elbow