Innebygget overtrykksventil og frostbeskyttelse
5 LP og 2 HP porter
Godkjent for 200 meters dybde
Fra anmeldelse hos TDX (Team Exploration Divers)
"The 1st stage is very heavy and made from the finest materials. The Xstream has two HP ports and five LP ports. Looking at the inside of the 1st stage there is a massive heat sink with a very large spring which takes heat from the water. The mechanism is a balanced diaphragm with a red ruby ball. The red ruby ball reduces dependency on the o-rings. The reason why Poseidon uses the red ruby ball is because the ball helps prevent free flow. The red ruby ball is VERY resistant to wear."