9
Type of Hose Being Connected:
Determine whether the hose that you are installing requires connection to an HP port
(for a pressure gauge or breathing gas integrated computer), or to an LP port (for an
octopus second stage, or a BC or dry suit inflator).
Be sure that you only place high pressure accessory hoses in ports specifically marked
with the letters 'HP', or '4500 psi / 300 BAR'.
Orientation (positioning):
Orientation is defined by the location of the LP ports when the first stage is mounted on the
tank valve. Mounting the first stage so the LP ports are lower (closer to the tank) than the
HP ports is referred to as the DOWN position. Mounting the first stage so the LP ports are
higher (further away from the tank) than the HP ports is referred to as the UP position.
Using the DOWN position produces the lowest overall regulator/tank profile, reducing the
possibility of your head coming in contact with the first stage during your dives. Also, in
the DOWN position, the venturi assisted LP port will be positioned so that the primary sec-
ond stage is on your right side.
By mounting a first stage, such as the PX2, that utilizes a swivel section for the LP connec-
tions in the UP position, you can obtain greater accessibility to your hoses due to the
swivel being positioned approximately 4 inches higher than in the DOWN position.
The convenience of two HP ports provides for consistent positioning of your instrument con-
sole regardless of the orientation of the first stage. Note that the SP4 and Explorers only
have one HP port.
Experience and experimentation will be your best guide to choosing the orientation that is
best to satisfy your needs and preference.
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