It's better to not have and not need it, than suffering the hassle and expense a burst pipe can cause.
The clamp fits pipe sizes 10mm, 15mm and 22mm (3/8in, 1/2in & 3/4in)
The tool is so easy to use, see for yourself by watching the video below
The Plumbing Mate
Unit 4, Beaver Centre,
Tel: 01606 45385