Compatible with most flat roofing materials, including bituminous felt and PVCu roof membranes, unique pre-drilled flange for secure anchorage. Comprehensive range of sizes available for water tight jointing to 82, 110 or 160mm PVCu pipe work. Non corrosive hi-filter grille design offers efficient filtering and can be easily removed for periodic cleaning and maintenance. - Suitable for industrial, commercial and domestic applications - Integral ribbed clamping for ring for complete retention of roofing felt or membrane. - Unique pre-drilled anchorage points, stops product from lifting during assembly of pipework - Compatible with most flat roofing materials - Quick and easy install, choice of socket or spigot tails available - Fully compatible with 110mm PVC pipework, no adaptor required - Cost effective alternative to complicated and expensive metal outlets and pipework systems.