Yes - use a rubber tee sleeve. Ask at a plumber or builders merchants.
http://www.fernco.com/plumbing/flexible-couplings/qwik-tees-ells[/QUOTE]
i've never seen these couplings before and they look quite good, but another make you could consider is timesaver, they are similar to these but are made of cast iron and have clamp plates to join to the existing cast and your new plastic
Timesaver BS 416
The Timesaver system, was first launched in 1973, for use on above ground soil and ventilating installations.
The system was recognised for its quality performance, and was awarded the highly coverted BSI Kitemark in 1982. Over the years, Saint-Gobain PAM UK has maintained its programme of quality controls, and is licenced under BS EN ISO 9001:1994, Quality Assurance in recognition of its high standard of production competence.
35 years proven performance, on the most prestigious commercial and public buildings throughout the UK and the world markets.
Extensively used for refurbishment projects
Timesaver range includes Heritage push-fit couplings that turns a mechanical pipe system into a system with a traditional socket appearance of yesteryear, as depicted in BS 416 part 1.
Making Timesaver the ideal choice for traditional external soil stacks.
Timesaver BS416
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