Waterway Dyna Flo Top Mount Front Access Diverter Plate [2 Pack] (519 3010) controlsystems The 48 PSL40 SB is a practical The 48 PSL40 SB is a practical replacement when a compatible Hydro Quip PS B Series setup needs a 4 The 9307S is a smart choice when a compatible pneumatic system calls for larger line shutoff with a serviceable 3 piece design and a stainless steel paddle upgrade A part like this is useful because it helps restore internal flow control function within the skimmer or filter assembly while giving you both required plates in one replacement package Replacing paired internal parts together can be more practical than trying to reuse mismatched older components