Die-cast aluminum flange.N°6 holes equidistant ø7 on pitch circle ø144 mm.Outer diameter 154mm, thickness 6 mm.Version with screws that do not protrude from the counter flange for membrane fixing.The double membrane system includes a first element in EPDM rubber, which ensures sealing and also acts as a gasket for the fixing holes, and a membrane in AISI 316 / EN 1.4401 stainless steel superimposed, the only one to come into contact with the product, also guaranteeing greater mechanical resistance.