Praher Plastics E-4-S1 M6 Screw for use with 1-1/2", 2", and 3" Praher ABS Sidemount Multiport Valves. Constructed from Type 304 Stainless Steel to withstand corrosion and oxidization. Praher Plastics is a leading producer of Thermoplastic Valves and Fittings. Easy to install and designed for durability, trust Praher for your pool or spa replacement parts.