Grid Controls PVC Union [1-1/2" Spg/2" S x 1-1/2" Spg/2" S] (3055) fuses and the buttress thread design

and the buttress thread design should be matched carefully to the intended Waterway assembly

The AquaStar ChemStar CH100 control valve is designed for compatible feeder applications that use a 1/2 inch valve component to regulate flow through the ChemStar system

A control pack like this often improves more than one part of the spa experience at once because it sits at the center of daily function

3 inch face diameter

Grid Controls PVC Union [1-1/2" Spg/2" S x 1-1/2" Spg/2" S] (3055) fuses and the buttress thread designA PVC union helps connect compatible plumbing sections while preserving the option for future separation, and this Grid Controls version uses a combination 1 1 2 inch spigot or 2 inch slip connection on both sides with the 3055 reference. This dual size style is useful when plumbing layouts need flexibility in how the fitting is integrated. The convertible connection format gives this union its own practical value because it can work within more than