1. Adjustable Propane Fill Adapter: Our propane fill adapters have an adjustment button, and since propane is heavier than air, do not use it indoors; Inhalation of large quantities of propane is toxic and highly flammable, propane adapters are often used outdoors, in camping. 2. Non Leaking Design Adapter: Our adapter shell is integrally stamped and formed, there are no gas leaks, the silicone oil will mix up with the propane while not in use; The silicone oil will not leak out from the stem. 3. Safety and : The airsoft loader is made of high quality aluminum, and the adapter's solid brass materials ensure longevity as well as universal usage; It's perfectly to refill 1lb disposable green propane bottles; The refill adapter is heavy duty and reliable. 4. Instructions for Use: Add 3 drops of silicone oil into the oil port before filling; The silicone oil will mix up with the propane while not in use; The silicone oil will not leak out from the stem; Only when you press the stem, the silicon oil will go out with propane.