The EPDM Rubber Through Wall Drain Outlet 100mm x 100mm requires a hole size of 105mm X 105mm.
This through wall outlet is a synthetic EPDM rubber outlet for use on flat roofs with parapet walls to form a through wall outlet so that water can be dispersed into a drain hopper or similar soak away.
This can be used with EPDM Rubber roofing membranes and can be fitted above or below the mebrane to suit the situation. EPDM Flashing Tapes and Tape Primer should be used to create waterproof finish in areas where water ingress is possible.
Please see the EPDM installation Manual for tips.