Leak at base of cistern after installing New syphon

[cooa99]

Hi all,

Without dragging an old tread of mine up ... I finally over the weekend removed a couple of tiles to get to the concealed cistern so I can replace the old faulty syphon with the new Top Serviceable ones.

I purchased the dudley turbo 88 syphon, Followed the youtube & printed instructions for replacement. Poured some water into the cistern and there appears to be a slight water leak at the bottom of the cistern where the backnut touches the base of the cistern

No matter how (slightly) hard I tighten the the backnut with the spanner, I still get a leak. So looks like the black washer on the inside is not making a complete seal. I am afraid of over tightening and cracking the cistern.

Anything else I can do or simply purchase a different brand syphon?

Thanks

 

[Dan Robinson]

Smear a bead of silicone sealant on the washer before tightening.

Make sure all the surfaces are dry first.

 

[cooa99]

Thank you very much, i'll give that a try tonight when I get home.

 

[oilboffin]

Use a new donut.Bob

 

[terryplumb]

Use a new donut.Bob

Its a concealed cistern ,doesn't have a do nut. But would be advisable to fit a new flush cone seal. ( where the flush pipe goes into the pan ).