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Madbull Airsoft Propane Adapter with Silicon Oil Port
Special Features:
(1) Silicon oil container: Store silicon oil and lube your GBB with refill
propane.
(2) Non-leaking design: The silicon oil will mix up with the propane while not
use. The silicon oil will not leak out from stem. 
(3) Mixed propane with silicon oil: Only when you press the stem, the silicon
oil will go out with propane and go inside to your GBB magazine.
(4) Better materials: Stainless material core structure (yellow color) with
Aluminum shell (red color)
(5) High quality and low price. The Ultimate version of Propane adapter.
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