"(2) 3/16 INCH O.D. PRESSURE FITTINGS ARE SUPPLIED FOR PRRESSURE CONNECTION WITH 1/4 INCH PUSH-ON TUBING. 3/16 INCH I.D. TUBING IS SUGGESTED FOR TUBING LENGHTS UP TO 100 FT. 1/4 INCH I.D. FOR TUBING LENGTHS UP TO 300 FT. 1/4 INCH I.D. TUBING LENGTHS UP TO 900 FT; SERVICE: AIR AND NON-CONDUCTIVE GASES; OUTPUT:4 TO 20 MA, 2-WIRE; MAX PRESSURE: 10 PSIG; LOOP RESISTANCE 0-800 OHMS"