Waterway DynaFlo Plus/DynaFlo Low Profile Round Weir Assembly [2 Pieces] [Grey] (550-2637) presairtrol If you are unsure about

If you are unsure about compatibility

reducing the chance of backflow that can create nuisance issues in the system

or routine system monitoring

and this Magic Plastics UniBody version features a 1-1/2 inch union by 1-1/2 inch spigot configuration with a 100 psi rating using the 0517-15 reference

or no longer swings as intended

Waterway DynaFlo Plus/DynaFlo Low Profile Round Weir Assembly [2 Pieces] [Grey] (550-2637) presairtrol If you are unsure aboutThe Waterway 550 2637 round weir assembly is designed for compatible DynaFlo Plus and DynaFlo low profile applications and comes as a 2 piece assembly in gray. A part like this is useful because it restores the skimmer door action that helps regulate surface water entry into the skimmer housing. Weir assemblies play an important role in surface skimming performance, and replacing the correct version helps preserve the original movement and fit inside