Torpedo Hatch Switch Open/Closed J4001 Normally-open, 9/16 – 18 UNF-2A thread J4002 Normally-closed, 9/16 – 18 UNF-2A thread J4311 Normally-open, .625 – 18 UNF-2A thread J4312 Normally-closed, .625 – 18 UNF-2A thread Make The "Switch" to CPI If your momentary switch application demands high performance, we think you should demand CPI. Please call us today to speak with our engineering team about your needs. (973) 887-9400