Check the listing for details. Charging Valve 1/4 SAE Thread Adapters Shut-off Flow Control. Condition: New. Listed at 18.49 USD. What is this?The charging valve usually fits for the self-sealing can which has a 1/4 SAE male thread. Widely used on the HVAC systems, mainly for the refill of air conditioner refrigeration.What will I get?Material: BrassColor: Gold ToneThread Size: 1/4 SAETotal Size: 34x19mm / 1.34"x0.75" (W*H)Package Content: 1 x Charging ValveAre there any advantages of the product?Made of brass material, with good strength and rust resistance . The on-off knob is helpful to control the flow of gas. The screw thread connection is secure and tight.How to use it?Connect the male thread to the tube and hose line. At the same time, connect the female thread to the bottle or can. After the screw thread is tightened, you can open or close the gas through the knob.