The Brew Cabin

I have a square section yard gulley for draining the garden which has an integral bend. Looks like a cross between the yard gulley and p trap & hopper shown on the drainage page. It was probably fitted in 1940's when the house was built and it is now cracked and I intend to replace it before starting block paving.

It is connected to a clayware pipe with a mortar joint. Can someone tell me
a) the best way to remove the fitting and mortar joint without cracking the clayware pipe.

b) the best way to connect a replacement plastic fitting to the clayware pipe.

Thanks

Use a nangle grinder or cut-off saw to cut through the pipe downstream of the collar where you want to make the new connection. This will leave you with a clean 4" diameter clay pipe without the female collar. Next, you need an adaptor coupling - these are readily available from the better BMs and Civils Merchants. You'll need to tell them that you;re connecting old, imperial, slatglaze clayware to new 110mm uPVC and they'll sell you the right part at a silly price (about a fiver! )

There are 'adjustable' couplings, that use something akin to giant Jubilee Clips to form a tight seal at both ends of the coupling, but these are even pricier and are normally used on larger jobs. For a simple gully connection, one of the adaptor couplings will be fine.