Length of waste pipe in soil pipe boss

[DKenn]

Hi those in the know!

This may be a stupid question, but when putting a waste pipe (e.g. 32mm, 40mm) into a boss connector with snug, how much should protrude into the soil stack, and should the end be finished in some way?

 

[muggles]

It shouldn't protrude at all, there should be a stop in the boss adaptor to prevent this. What did you mean by "with snug"? You're not trying to use a Pipe Snug as a boss adaptor are you? That's not what they're for.

 

[DKenn]

The boss is for a 32mm, 40mm or 50mm pipe. The boss reduces this to 40mm. However the hole in the boss allows a 50mm pipe through it.

It is a standard FlowPlast 110mm strap boss, using a 40mm rubber snug.

The snug will allow the pipe all the way through, as will the boss.

 

[Servotech]

It really wants to be no further in than the outside of the soil pipe.
Just chamfer the edge to ease it past the rubber seal and de-burr the inside.
NB. Some bosses these days don't have a stop in them as I found out when leaving the apprentice to finish off and he shoved the waste pipe right though to the far side of the soil pipe!!
I could go on but It's best I don't as there could be some bad language involved!

 

[DKenn]

In the end I chamfered the end of the waste pipe and measured it to protrude a few millimetre into the stack.

Thanks for your help.