Tecmark Latching Air Switch - 16A up to 250V | NC & NO. Most applications use the Normally-Open pins (top & middle). Older white ones broke at the connection after several years. Replaces TinyTrol, Pres-Air-Trol, Tecmark and others. 

Fits many Astralpool & Hurlcon Air Switch boxes, Blowers, Davey Pumps, Edgetec Pumps, Hurlcon Timer Boxes and other pool equipment. Higher quality than many found. 

Note the first image is the style that supersedes all others. Cannot be activated by lung pressure. Requires a good quality air button and air line.

Replaces TBS301A, TBS-301, TBS-305, hq34-0002, PresAirTrol TVA 411E and many many others for up to 16A @ 240V. 100,000 cycle life.