Sim/Tech Filter orifice shields are designed to protect the discharge holes in pressurized systems from the outside.  Most of these systems are designed with specific flow-rates, pressure heads, etc. to obtain “even distribution” in the drain field and thus allow for proper treatment.  Much like our pressure filter prevents debris from obstructing the discharge holes from the inside, our orifice shields prevent blockage on the outside.  As shown in the top picture to the left, drain media can block the small discharge holes, throwing the whole design and operation of a system out of whack.  The bottom picture to the left shows our standard orifice shield installed on the lateral piping of a system.  The orifice shield creates a protective void between the drain media and the discharge hole.  The design allows the discharge hole to spray effluent into the shield where the much larger open area of the shield keeps the hole discharging at its designed flow rate.