Model 355-2 incorporates a regulator and flowmeter into one compact unit. It is compensated to 20 PSIG. The flow tube and float are easily changed for different gases. As supplied, the flow tube has dual calibration. It includes a sensitive needle valve for finger-tip control and durable, easy-to-read, flow tube and cover. The regulator features a brass body, steel dual scale gauge and one-piece encapsulated seat desgin with internal filter and PTFE Teflon® seat. This flowmeter regulator is UL® listed. The outlet connection is 5/8" - 18" (F).