Join the conversation on home & energy. Opens drains clogged by grease, hair and other organic matter, controls root growth, and opens grease traps fast without the dangers associated with acid type drain openers. Conventional and system boilers often cost a lot. It is a fully packaged unit that is housed in an elegant enclosure which is compact in size and has been designed to fit into a standard domestic airing cupboard. Pipes with internal diameters ranging from 75mm to 250mm.