You have a Poseidon Regulator and you want to use a standard regulator hose or maybe increase the second stage regulators comfort when it's in your mouth with an XS Scuba's Miflex Hose (SKU: XSSLPH). The XS Scuba's Poseidon Hose Adapter allows you to use any standard low-pressure hose with your Poseidon X-Stream or any Poseidon Second Stage with M31-1.5mm inlet threads. Adapter is constructed from black chromed brass for durability and corrosion resistance. The adapter does not come equipped with a built-in relief valve and is designed for low pressure only below 200 psi (13.8 bars).