Dive Rite DRT-43-4 Quick Start Manual Download Page 1

User Product Data Sheet 

VER 1.2 

DRT-43-4 EZ Solenoid Inline Shutoff 

 

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DRT-43-4

EZ Solenoid Inline Shutoff

 

Product Description 

 

EZ Solenoid Inline Shutoff 

The EZ Solenoid Inline Shutoff gives the rebreather diver 
positive control of the on-board oxygen supply when dealing 
with ascents or with troubleshooting.  Located near the oxygen 
manual-addition valve, it also allows for easy connection of an 
off-board oxygen source.  Only one hose leaves the oxygen 
cylinder and plugs into the manifold mounted to the oxygen 
addition valve. 

A Right-Angle Adapter (RG1350/RG1355) must be used to 
route the solenoid hose up thru the slot in the frame with 
oxygen manual-addition hose from the first stage.  It is 
suggested that the oxygen-regulator Over-Pressurization (OP) 
valve be moved to the original position of the solenoid hose in 
order to better protect it. 

Installation 

First-Stage Hoses, Over-Pressure Valve and Port-Plug 

• 

Using an 11/16 open-end (or similar) wrench, remove the 
oxygen (green) low-pressure hose from the canister. 

• 

Using a 9/16 open-end wrench, remove the other end of 
the hose at the oxygen-regulator first stage. 

• 

Using a 1/2-inch open-end wrench, remove the OP valve 
from the oxygen-regulator first-stage. 

• 

Insert the OP valve in the hole where the low-pressure 
hose was removed, and carefully tighten using a 1/2-inch 
open-end wrench.  Do not over-tighten. 

• 

Insert a port-plug (RG1245Black) in the hole where the OP 
valve was removed, and carefully tighten using a 1/8-inch 
Allen wrench.  Do not over-tighten. 

NOTE:

 The rebreather should never be used without 

the OP valve.  It is an important piece of safety 
equipment should the high-pressure seat of the first-
stage fail, causing a rupture of a hose and potential 
injury. 

 

 
Canister Right-Angle Adapter 

• 

Using an 11/16-inch wrench, remove the hose from the 
oxygen-supply port at the bottom of the CO

2

 absorbent 

canister (if not already done). 

• 

Using an 11/16-inch wrench, carefully install a RG1350 
Right-Angle Adapter (not included) to the oxygen-supply 
port at the bottom of the absorbent canister and tighten.  
Align the Adapter so the open-end is pointed inwards, or 
towards the centerline of the rebreather.  Do not over-
tighten the fitting. 

• 

Using an 11/16-inch wrench, carefully attach an HOLP28G 
oxygen hose to the Right-Angle Adapter and tighten.  Do 
not over-tighten the fitting. 

NOTE:

  A hose with an in-line shutoff should not be 

used in this application. 

• 

Route the hose through the slot in the frame and along the 
right shoulder to the EZ Solenoid Inline Shutoff and attach 
it, using a 9/16-inch wrench. 

 

EZ Solenoid Inline Shutoff 

•  Remove the oxygen hose from the oxygen manual-

addition valve on the right counterlung. 

• 

Attach the EZ Solenoid Inline Shutoff to the oxygen 
manual-addition valve. 

• 

Re-attach the oxygen hose to the open EZ Solenoid Inline 
Shutoff port. 

 

 

 

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