Waterco 2290822 3" Side Mount Multiport Valve for Filter - This 3" Side Mount Multiport Valve is for use with a filter. The one-piece body made from moulded glass-reinforced engineering plastic provides incredible strength and durability. 304 grade stainless steel is used throughout to withstand harsh water conditions. Multiple valve positions are available with the turn of a handle, including: filter, rinse, bypass, backwash, winterise and waste.