If you have a mechanical spa pack, an air button is connected to an air switch with air line (tubing) to operate your hot tub pump(s) & spa light.
Hot tub air buttons are usually installed on the top edge of your spa & used to control air switches that are connected to pumps and lights (recommended spa hole size: 1-1/2").
Air switches are connected to air buttons with air button line, to control components like pumps & lights.
Tecmark (Tridelta) Air Switch SPDT - Latching, 25A
Air switches are connected to a top side air button to control components like a pump or spa light.
Tecmark (Tridelta) Air Switch DPDT - Latching, 20A
Air button tubing connects an air button to a mechanical air switch. (1/8" I.D. X 1/4" O.D.) Sold by the foot.