Unless you are doing long dives the 13 is big. If you are using an aluminum cylinder for an argon bottle, and transfer filling it, not boosting, you are not going to get a full argon fill into the bottle. I think the storage bottles are filled at like 2600 but i am not sure. I top mine with air after the argon to get a full fill and never noticed the difference in warmth. Some people use a low pressure bottle to get a full fill. Some go with that oms low pressure 13 or 14? You can get a full fill on it if you are transfilling. The 13 on the doubles can hinder your penitration into spaces you could get into before with doubles only. Some people have rig the 13 differently than on the plate or on the doubles. The 6 on the plate for wreck diving is good even on longer deep dives if you can get a full fill or if you dont mind topping the 6 w/air if you are not boosting...JD


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