Welcome! For sale is a great tool for HVAC-R Technicians. The tool prevents refrigerant burns to your hands when removing your gauges from the access ports of refrigerant lines- especially liquid lines. At the same time the system charge stays the same.This can become very useful when the charge amount is critical. The connection size is 1/4" male X 1/4" female. This Kwik- Coupler only works on 1/4" connections. -Length 2 inches -Material : Brass -Brand-New in manufacturers shrink-wrap packaging -Free Shipping