Waterway 1/2" Air Control [1-5/16" HS / 1-11/16" FD] [Straight Nut] [Deluxe Scalloped] [White] (660-3100) airsupply and this Intermatic T101R version

and this Intermatic T101R version includes a case and is designed for 115 volt SPST applications using the T101R reference

Praher SM-20-2 replacement multiport valve

This replacement is especially useful when the original union end is cracked

That is exactly the kind of stability a properly matched BP1500 replacement is meant to support

Waterway 1/2" Air Control [1-5/16" HS / 1-11/16" FD] [Straight Nut] [Deluxe Scalloped] [White] (660-3100) airsupply and this Intermatic T101R versionThe Waterway 660 3100 air control is designed for compatible 1 2 inch air control applications using a 1 5 16 inch hole size and a 1 11 16 inch face diameter. Its straight nut configuration and deluxe scalloped styling make it a useful option for installations where both reliable function and a more decorative finish are important. This control helps manage the air introduced into the spa system, allowing the user to adjust the character of the jet