Issue with 1st Iteration
At issue with this configuration is the bungee's ability, and habit, of getting caught in the corrugations. This inconvenience can make it difficult to elevate the deflator sufficiently to dump gas.
3rd / Final Iteration
To prevent the issues from the 2nd iteration from occurring again, I simply placed a second piece of inner tube on the corrugated hose. Where the first piece is near the top of the hose, I placed the second inner tube down near where the LPI connects to the inflator nipple.
After running the LPI through the bungee, I then run it through the second inner tube. By doing so, the lower inner tube prevents the bungee from working itself down to the hose connection.
Tidying Up the LPI Hose
Before moving on to the next iteration, let's first address the LPI hose routing. To keep it clean, simply cut a couple of ~3/4" pieces of bicycle inner tube. Place the inflator mechanism through the inner tube, and run the inner tube toward the top of the corrugated hose, near where it connects to the elbow. We'll address the 2nd piece of inner tube later.
Now, simply run the LPI through the inner tube, alongside the corrugated hose. This keeps the hose routing neat and tight.
WING INFLATOR HOSE ROUTING
The issue with the 2nd iteration presented itself on a dive rather quickly.
The bungee had become lodged where the hose fitting was connected to the inflator nipple. When I raised the mechanism to dump gas, the bungee popped the hose connector off the nipple.
While it was a minor inconvenience reconnecting it with dry gloves, it did happen a second time within a couple of weeks, so it was time to find a new configuration.
To prevent the bungee from getting caught between the corrugations on the corrugated hose, I simply ran only the LPI through the bungee. The slick hose allows it to move freely along the bungee, yet both the LPI and corrugated hoses are still held in place by the bungee when not in use.
This is probably the most common hose configuration. One where both the corrugated hose and LPI are both routed through a loop of bungee. The bungee is a simple ~2 1/2" loop of 1/4" shock cord. It's held in place by being placed between the harness webbing and the tri-glide that holds the left chest D-ring in place.
Routing the hoses through the bungee ensures the inflator/deflator mechanism always stays in the same position.
Note, however, in the 2nd picture, how the LPI isn't routed cleanly, instead bending away from the corrugated hose, creating a hose routing issue. We'll address this in a bit.
Hardware & Supplies
Wing (note the simple 90 degre elbow)
2 3/4" pieces of bicycle inner tube
Putting it All Together
The final result is clean and tight hose routing.
Note in the picture below left, the LPI goes through the upper inner tube, then the bungee, then the lower inner tube. This keeps the hose routing clean and tight, while also preventing the bungee from working its way down to the hose connection, while still allowing only the LPI to be run through the bungee, allowing free movement without the bungee getting caught in the hose corrugations.
The BC or wing inflator system consists of the wing's corrugated hose, connected to the wing itself via a plastic elbow, and the low pressure inflator hose, also called an "LPI", connected to a 1st stage regulator.
The corrugated hose can be of varying lengths, depending on the diver's preference. I prefer a shorter length hose of ~12-13", to keep things neat. My LPI hose for a 13" corrugated hose on a doubles wing is ~21". On a singles wing it's probably ~18-20", as the first stage is behind the diver's neck, instead of behind the right shoulder.That seems to be the ideal length for a corrugated hose of that length.
Use proper length hoses to ensure clean hose routing and to avoid having hoses stick out or "up" unnecessarily where they could damage (or be damaged by) the cave or wreck, or entrap the diver. The LPI hose's length should be such that it's not so short that it wants to pull the corrugated hose, allowing it to lay how it wants to naturally, but not so long that the LPI stick up or out, or has a large loop. For more info, see our Doubles Regulator Configuration or Single Tank Regulator Configuration pages.
Additionally, the corrugated hose's elbow should be a simple 90 degree elbow, with no one-way, over-pressure valve, as the valve can be pinched, allowing water to enter the bladder and rendering the bladder unable to hold gas, creating a potentially dangerous buoyancy issue.
This page illustrates one method of routing the LPI with the corrugated hose. While it's certainly not the only way, it's a configuration that I prefer after trials and (multiple) errors and hundreds of dives, finally coming to this solution.
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