1. This adapter housings are integrally stamped and designed to no gas leakage. Made of high quality aluminum to and universal use. 2. This Propane filling adapter is equipped with a pressure gauge so you can observe the amount of gas used. It's with air escape valve, can let the air out when you needed. 3. Ultimate Version of Propane Adapter: Use with any Standard Camping-style Propane Tank for replace green gas. Store silicon oil and lube your with refill propane. 4. Cost-effective Replacement for Green Gas: Propane filling adapter strictly adheres to standards for camping-style propane tanks, an affordable option for disposable green gas tanks, propane tanks and more. 1. The cap will vary from batch to batch, which will not affect the use. 2. The vertical stainless steel needle in the middle is linked to the gas cylinder. When the needle is pressed down, the gas cylinder will have gas out. If it is not pressed, there will be no gas out. The knob is for exhaust and pressure relief. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Blue Material:aluminium Package Contents: 1 * Propane Fill Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.