Slide the compression nut and ring onto the pipe push the pipe into the fitting and tighten the nut. From clay to plastic, we are experts! Why, a plumber would be ashamed to take as long as that over a job! Advice for people affected by child abuse. Boiler problems? talk to frank! This time, i was told the pipes could be connected to the new boiler, but northern gas heating “would not be responsible for any leaks”. Is your boiler losing pressure? Michael.