Regulator configuration suitable for single tank AND sidemount?

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I have dedicated SM regs, but sometimes I strip down backmount regs as SM loaners for other people. It's not a hard job... just need a spanner and hex. It's worth having dedicated HP/SPG for each though.
 
If you have an AI transmitter on your right post and dive a redundant bladder, you don't have to do any switching at all to go between backmount doubles, sidemount, or single backmount. The only extra piece you need is a din manifold for when you do single backmount. The manifold receives the two din first stages.

Sidemount is not super elegant as you have to bungee your left side / post spg and right side /post inflator hose, but a lot better if you don't want to have to keep reconfiguring things.

I switched back and forth between backmount single boat dives in the morning and sidemount double shore dives in the afternoons this way on a recent trip and it worked ok. All I had to do was unscrew the first stages from the manifold and attach them directly to each of the tanks. I couldn't do backmount doubles at all because of the logistics involved, but could have if they had been readily available.
 
https://www.shearwater.com/products/peregrine/

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