• Preset purge (25 to 35 cfh), braze (3 to 6 cfh) and pressure test (500 psi) settings
• Regulator and flowmeter in one
• Hand tight cylinder connection no wrench required
• Rubber boot protected cylinder content gauge
• CGA-580 cylinder connection
• Rugged solid brass body
• Industry standard 1/4 in SAE flair outlet
• Large, easy to read selector knob TST, PRG, BRZ, OFF

Nitrogen purge is an often overlooked, but critical step in 410a installations. The nitrogen displaces oxygen in the lines and minimizes formation of oxides which can dislodge and get trapped in the TXV or metering orifice, causing premature compression failure.