Amazon.com : COLOR TREE Airsoft Propane Filling Adapter for Green Gas Tank with Silicone Oil Port Gas Adapter : Sports & Outdoors

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✅ Use with any Standard Camping-style Propane Tank.
✅ Completely Reusable and is a great substitute for Green Gas.
✅ Silicone oil container: Store silicon oil and lube your GBB with refill propane.
✅ Non-leaking design: The silicone oil will mix up with the propane while not use. The silicone oil will not leak out from stem.
✅ Mixed propane with silicone oil: Only when you press the stem, the silicon oil will go out with propane and go inside to your GBB magazine. For Airsoft use ONLY. Add 3 drops of silicone oil into oil port before fill. Do NOT use WD-40 as a substitute for silicone.