weeping/leaking waste from shower trap

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fitted one of these and it still leaks
http://www.screwfix.com/p/opella-domed-shower-waste-trap-90mm-3/90912
tried plumbers mait on top and silicone below - it like i cant get it tight enough (so feels damp under neath) one side (at the front) i cant get it to sit straght.

any thoughts please - at the moment my dad has silconed it it not leaking so not causeing a major probem but the silcone feels damp.

:(

comments on line seem to suggest it only fits chunky thick shower trays?! at it only sells with a rubber washer
 
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Its designed for the thicker ceramic or stone cast shower trays, this one.....always try a dry run if you can to see if you can get it tight enough, and a good squidge of silicone where the trap meets the tray topside is essential.
John :)
 
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Personally I wouldn't like to risk any water leak at all from a shower, so I'd avoid altering any particular product.
I find that McAlpine wastes are the best out there, so if you can find a supplier try assembling the thing on the bench, and see how close the trap can be screwed together.
Opella is another good make.
John :)
 
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anyone know of any that fit thin shower trays or is it best to have a bath trap??!

i need a wide waste (at the top) say 3 inch

thanks
 
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Google McAlpine shower wastes, and you'll find 11 types that will fit a thinner tray....they don't come with any trap though - you can fit whatever you like, so long as there's space under the floor.
John :)
 
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I'd be very surprised indeed if it didn't come with a backnut.....the threads however are all the same in this size so it would be easy enough to get one - most of us have loads of them spare!
John :)
 
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