Waterway 1" Notched Air Control [1-5/8" HS, 2-3/4" FD] [Black] (660-3571) sandfilters the improvement is noticeable in

the improvement is noticeable in how evenly the spa performs

and R185B IID heater applications where the supported sensing component needs replacement

This part has practical value because the panel-mount format helps preserve original installation style while the 7-day capability adds greater scheduling flexibility

or no longer switches the connected equipment reliably

Waterway 1" Notched Air Control [1-5/8" HS, 2-3/4" FD] [Black] (660-3571) sandfilters the improvement is noticeable inThe Waterway 660 3571 notched air control is designed for compatible spa air systems and features a 1 5 8 inch hole size with a 2 3 4 inch face diameter in black. Air controls like this are used to manage the amount of air introduced into the system, helping fine tune the feel of the jets and the overall spa experience. The notched design is useful where the installation calls for that specific control style, and the black finish can be a good visual