Orifice shields from Sim/Tech Filter are designed to prevent drain media, such as drain stone, from blocking discharge holes so pressurized systems distribute effluent evenly. The shields have a sturdy design that keeps them firmly in place after snapping them on the laterals. The large amount of open area between the pipe and the shield allows for easy placement over the holes and reduces media clogging by debris. Two styles are available – one for top discharge distribution holes and one for bottom discharge holes. Shields are available to fit 3/4-, 1-, 1 1/4-, 1 1/2-, 2- or 3-inch pipe. 888/999-3290; www.simtechfilter.com.