Kitchen Sink waste pipe falling down

[Hels13]

Evening all, 

 

I've just noticed tonight my waste pipe was leaking under the kitchen cupboard. 

I've reconnected them all, but the pipe that connects to the half sink keeps popping back off amd dropping down. 

Could an easy solution to be to replace the downward pipe circled in picture with a longer pipe? If so, what type of fitting would thus be called? 

 

Thanks, Helen

 

Edited July 21 by Hels13
To add in extra detail

[MikeGrahamT21]

Push it all back together and tighten it up as best you can, and then pack underneath the u-bend with whatever you can find, offcuts of timber will be ideal, so that gravity can no longer do it’s thing

[Onoff]

Is the sink an IKEA one per chance?

[Nickfromwales]

Get some 60 grit sandpaper and sand the pipe so the rubber seal can grab onto a roughened surface vs the shiny surface it's currently trying (poorly) to cling on to. Sand around the diameter, not up and down the pipe, as you want 'rings' of scratches so the seal can bite into them.

 

Oh, and tighten up the two John Guest Speedfit fittings in the background. Righty-tighty, as they're both nearly fully undone! JG stuff sucks badly.

[saveasteading]

1 hour ago, Nickfromwales said:

tighten up the two John Guest Speedfit fittings

I thought they were push fits (and a bit scary to use). so you push then tighten?

[Gone West]

9 hours ago, Nickfromwales said:

Oh, and tighten up the two John Guest Speedfit fittings in the background. Righty-tighty, as they're both nearly fully undone!

And then fit the collett clips as in the MIs.

[Nickfromwales]

3 hours ago, Gone West said:

And then fit the collett clips as in the MIs.

I've not seen, literally even ONE, installer/plumber EVER fit them. Most merchants look sideways at you when you ask for them....and you always hear "never been asked for them so we'd have to get them in for you..."

[Nickfromwales]

11 hours ago, saveasteading said:

I thought they were push fits (and a bit scary to use). so you push then tighten?

Yup. JG invented a fitting which slowly undoes itself over time.....when installed without the clips @Gone West refers to.

 

The shroud around the fitting, the twist-to-lock piece should be closed tight to the body of the fitting eg no gaps as you see top & bottom in the OP's pic.

[Nickfromwales]

Loose:

 

 

Tight:

 

[Nickfromwales]

Loose:

 

[Gone West]

4 hours ago, Nickfromwales said:

when installed without the clips

Same with most things, if they're not installed correctly, you'll have problems. I've been using Speedfit for years, since I stopped using Hep2O in the nineties.

 

[Nickfromwales]

Hep2o these days is just wonderful stuff, but ironically they’ve made a new range of twist-to-lock fittings, methinks because the fit and forget fittings I’m used to were a pita to decouple, so marketing prob got involved to help folk who are fingers and thumbs. 

[Marvin]

The problem with the waste, in my humble opinion, is that the solvent weld vertical pipe is too short. What with the short length of pipe catching the fitting and the vibrations from the flexible grey waste pipe its going to fail. Another thing I do is dry off the sink first downpipe, and all the bits in the compression end of the junction pipe that grasp the top pipe, and silicone the parts, fit together and hold in position for 48 hours by propping. 

 

However, I still would not do this without lengthening the vertical solvent weld pipe.

 

Good luck

 

Marvin