The EP-215 CO2 regulator utilizes a fully adjustable 2 – 15 LPM flowmeter to output a precise flow rate. The Ep-215 includes a round flow gauge for easier viewing and adjustment vs using a floating ball estimation method.The unit uses a stainless steel diaphragm for durability and long lasting strength against CO2 freeze ups.This unit attaches directly to a CO2 cylinder with CGA-320 fitting.