140mm Outside Diameter, 85mm inside diameter
Designed to be fitted to a brick or concrete block pillar letterbox or wall. To be matched with 90mm plastic water pipe which is fitted through the letterbox unit when being built. Made from corrosion resistant and durable cast aluminium. Usually fixed in place using mortar when the pillar letterbox is being built. Plastic pipe not included, and can be sourced from a plumber, plumbers merchant or hardware supply store.