Jointing plastic strap boss to cast stack.

[Clint 1979]

Hi all,

I know connecting plastic waste to cast soil pipe has been covered in other posts but my question (which I can't find an answer to) is this......

When connecting a plastic strap boss to cast, what would/do you use to seal the strap connector to the cast??

Also is there anything on the market like a Tank connector with a split washer and dense rubber sealing washer (like the Essex Flange) that can be used, with a spigot to connect 1 1/4" 1 1/2" waste?

I have fitted the Mcalpine pipe boss connector into plastic soil for condensate before but not sure if that fitting can be used on cast??

Thanks for any advice

Clint

 

[goz666]

You can get a boss connector from McAlpine that isn't strap on, drill the hole to required size and slot in, maybe if you're worried about leaks just use clear silicone as a precaution.


4"/110mm x 1¼" Pipe Mechanical Cast Iron Soil Pipe Boss Connector (Black) | McAlpine Plumbing Products

 

[Clint 1979]

Thanks goz666, that's what I used before on a plastic stack for condensate, I see screwfix do the mcalpine one which takes a 57mm hole instead of 22mm so will probably give that one a try.
Definitely worth adding some sealant of some sort as it's under the floor in a bathroom.....might even stick a couple of long cable ties round for belt and braces 🙂