Triple Rubber Mushroom Seat Great new Rubber Mushroom Seats, delivered complete with ground fixing and assembly kit, for fast, simple installation. Available as single seat, double seat or triple seat. All tops are bolt down for greater security, no glue required. Single seats available in overall heights of 200mm, 300mm, 400mm, 500mm. Double and triple seats not available in 200mm overall height. Mushroom tops are 450mm (D), galvanised stems are 165mm (D). The stems are made from fully galvanised steel, powder coated in a choice of five colours, red, blue, green, yellow and black. The EPDM rubber mushroom tops are also available in red, blue, green, yellow and black and can be mixed and matched with spot inserts and stems to create different colour combinations. Delivered fully assembled, for self installation.