Speedfit Layflat Polybutylene barrier pipe has even greater flexibility making the system very easy to handle & worry free. Flexibility – The pipe is ideal for long runs where a softer pipe material is an advantage so cabling through joists becomes a simple task. Easier to handle – When removed from the coil the pipe keeps straight & ‘lays flat’ meaning there are no issues with the pipe retaining its memory & trying to coil back into place. barrier Layer – The pipe is made from 5 layers the center of which is a coloured oxygen barrier which prevents the ingress of air into the system reducing the effect of corrosion on metal components.