Fitting McAlpine Drain to Waste Reducer

[phatboy]

I've got a few of these drain reducers to fit

Offset Drain Reducer Connector

4"/110mm Drain Connector with Offset Sealing Ring to fit plastic waste pipe to BS EN 1451-1:2017 and BS EN 1329-1:2020

mcalpineplumbing.com

I'm trying to fit 40mm waste into them, but if I push any harder I'm worried I'll split the rubber seal.

Am I doing this wrong? Should the seal be trimmed to allow 40mm pipes through, or just apply pipe lube?

Thanks

 

[CBW]

Usually a bit of lubricant

 

[johnny2007]

Washing up liquid, unless you want to splash on the specific lubricant (I use aquaflow and a tub has lasted me 10 years).
Curiosity: why don't you use solvent weld?
Permanent seal and rat-proof

 

[phatboy]

Washing up liquid, unless you want to splash on the specific lubricant (I use aquaflow and a tub has lasted me 10 years).
Curiosity: why don't you use solvent weld?
Permanent seal and rat-proof

I have some Polypipe lube left from doing the underground drains, so will pop a bit of that around it.

Not using solvent weld? Plumbing naivety - it's far from my specialist subject, and someone recommended I use these fittings. If you know of a better item please let me know... I need 4 similar setups and haven't bought the final 2 yet.

Thanks

 

[johnny2007]

You'll find that same adaptor in pvc rather than rubber.
Have a look in a builders merchant or upvc store.