Tiled Roof Dektite 100mm/125mm/150mm

This product won't stain or corrode spouting and gutters. The base is 99.9% pure grade aluminium – strong, malleable and much easier to install than a lead collar, and much safer too. Dektite provides a weather proof seal for your roof mounted exhaust fan/vent.
 
Fits flues with an external measurement between 50-170mm, so typically piping in 100, 125 and 150mm sizes but will fit anything from 50-170mm diameter.