Buy Fisher 3722 converter (4 to 20 mA DC input / 0.2 to 1.0 bar (3 to 15 psig) output). Electro-pneumatic converter that converts a 4-20 mA DC input to a 0.2 to 1.0 bar (3 to 15 psig) pneumatic output for the 3710 positioner. In stock, brand new, factory-direct price, ships within 48 hours.