John Guest Speedfit Low Fit Mounting Rail is designed for screed floor underfloor heating (UFH) applications when the insultation is too thin for staples. Suitable for new builds and extensions, especially ground floor levels, this pipe fixing method is fast and simple to install. It is also ideal for fixing pipework close to the manifold, creating a secure and symetrical finish once installed. 12mm pipe can be easily secured to the clip rails on top of the rigid insulation sheets, which is then placed over the concrete subfloor.