Not rocket science to own or use. The only trick is they come with different size hex holes.
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The other fun part is when they have been over tightened and incorrect hex keys used and it starts to round out.Not rocket science to own or use. The only trick is they come with different size hex holes.
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This^^^. I have experienced this and am glad that I had my adapter which I always carry. Never dive without it available.Came to find out they were indeed Pro valves, but the the inserts had never been removed. Like, ever. So they were now fused into yoke only. Good thing I brought my adapter anyway!
Or haven't been removed or rinsed in 3 years and essentially welded into the valve.The other fun part is when they have been over tightened and incorrect hex keys used and it starts to round out.
I ran into exactly this problem last summer in Marsa Alam. Tried all 7 adapters onboard with no luck. Sorted it out only after taking the oring from one adapter and installing it on another, which had a slightly different lip shape.One of the divers who was using yoke, did not have any problems on the first trip, but could not get his yoke to seal properly on the third trip. We must have tried 20 or 30 DIN inserts on the boat. He has never had any other problems anywhere. Meanwhile some other divers using yoke regulators from other manufacturers had no problem.
So, I am led to believe that it is an infrequent and unpredictable regulator manufacturer / DIN insert dimension interaction.