AP Diving Ltd. Medium Pressure and Convoluted Hose Shortening Instructions
Page 38 of 38
7.9 Updating the clamping System
The old style clamp fittings can simply be replaced by the new style Ty-wrap fittings, which
are easier to fit. All that is needed for each end of the hose are:
- 2 x Ty-wraps (RBCT1),
- A new cover (RB12-02-A) and,
- A new inhale locking ring (square thread; RB12-03-IN) or exhale locking ring (RB12-03),
depending on the type of hose you are updating.
The new version of the locking ring has a slightly smaller inside diameter that makes it easier
to remove the hose from the T-piece.
All these parts are available from AP Diving.
8. Testing Instructions
8.1 Test for leaks and proper operation
1. Test all MP hoses after shortening under pressure (around 9 bar) while submerging
them in water. Check for any bubbles, also when gently manipulating the hose and
connector.
2. Next, hook the pressurized MP hose onto their intended device coupling: BCD, wing,
counterlung, OCB, ADV, Auto Air or drysuit. Test the operation and verify gas flows as
expected and with sufficient throughput. Submerge in water and check for bubbles.
3. Test all convoluted hoses in the usual way, while hooked to the rebreather and
performing positive and negative leak tests.
8.2 Visual inspection
Visually inspect all hoses prior to use and if signs of damage are evident, postpone the dive
until the hose can be repaired or replaced.
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