The MZ hex. socket screw (no. 11) is a MZ spare part no 11. The MZ hex. socket screw (no. 11) is made from stainless steel. Metaltecnica Zanolo is the leading Italian producer of valves and are the inventors of brass slurry valves.
The Backing flange, round is a backing flange with SQ flange PCB standards for PVC stub flanges. It has a galvanised surface treatment and is available in a wide range of sizes. The Backing flange, round is made from steel.