tecmark tbs 300 series air switch 25amp spno latching tbs339 tecmark tbs 300 series air switch single pole, latching or momentary contacts, and are compact in size. wire connects are 5/16" male quick connect tabs and required panel hole is 5/8" specs: function - latching air switch type - single pole normally open (spno) model - tbs 339 air switch mount - 9/16" hole air tube connection size - 1/8" barb (b) switch amperage - 25a manufacturer - tridelta/tecmark