This valve is also known as QCC (Quick Closing Coupling) or OPD (Overfill Protection Device) The New ACME valve looks bulkier because there are external threads visible. The external threads don't necessarily require a change to the connector on the end of the regulator pigtail hose. They are compatible, as the left-hand-thread fitting on most hoses will screw into the internal POL threads of the new ACME valve.
However, one of the benefits of the new connector is that it is designed to be attached to the cylinder without tools. You only have to hand-tighten the connector. And, you tighten as you would normally tighten a threaded fitting, by turning it to the right (clock-wise). So at the cost of a few dollars it may be good to replace your hoses.
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