DGX HP Sealing DIN Plug w/Pressure Release

In Stock
This DIN plug prevents gas loss from leaks caused by the valve being inadvertently opened during travel or handling. This version offers a safety pressure release valve and is Nitrox Ready.

DGX HP Sealing DIN Plug w/Pressure Release

DGX HP Sealing DIN Plug w/Pressure Release
DGX HP Sealing DIN Plug w/Pressure Release DGX HP Sealing DIN Plug w/Pressure Release DGX HP Sealing DIN Plug w/Pressure Release
  • Eliminates accidental gas leaks from your valves
  • Includes safety pressure release valve
  • A true HP O-ring seal for 200-Bar and 300-Bar valves
  • Travel and move filled tanks with confidence
  • Perfect to protect all your technical gas fills

The HP Sealing DIN Plug provides a true high pressure O-ring seal in both 200-Bar and 300-Bar valves; it's primary purpose is to prevent gas loss from leaks caused by the valve being inadvertently opened. This version has a SAFETY PRESSURE RELEASE VALVE built into it as an additional feature and is Nitrox Ready.

The typical use is to protect an expensive (or just plain important) gas fill from accidental loss while the cylinder is being handled or transported. Our design is chrome plated brass, exactly the same material as your valve and thus is NOT subject to galvanic corrosion and galling. We have seen that happen with other plugs made of a dissimilar metal; all that's needed is a little saltwater moisture and then the plug seizes in the valve.

More Information
SKU DX-701302
Brand DGX
Weight 0.1500
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Damaged 300 bar DIN valve outlets

We occasionally hear from a customer that a new 300 bar DIN fitting on an adapter, gauge, fill whip or even a regulator is not compatible with some or all of the existing 300 bar DIN valves on their cylinders. Unfortunately the problem is more likely to be that the 300 bar DIN valve outlets have received an impact on the edge of the opening and are warped very slightly out of round. This causes a brand new fitting, perfectly within specification, to not be able to screw all the way in to the bottom of the warped outlet on the valve and fail to completely seat the sealing O-ring. However, it is not unusual for an existing regulator fitting or existing shop fill whip fitting to be able to seat because their threads are worn.

You should replace the valve, but sometimes the outlet is only very slightly out of round and might be made usable by a process known as "chasing and cleaning" the threads. You will need something to chase the threads and unless you are a machinist you are not likely to have the proper tools handy. We suggest using a HP DIN Sealing Plug and a wrench, or a Yoke Insert and a hex key, but in a pinch you could use a DIN Fill Adapter block and a pair of larger slip-joint pliers. Use the tools to force the fitting to screw tightly all the way in to the bottom of the 300 bar DIN outlet then back the fitting out completely and blow out the opening; repeat several times until the fitting easily screws in to the valve.

The risk to chasing and cleaning the threads is you damage the makeshift tool instead of correcting the valve outlet. It really only works if the outlet is very slightly out of round, so subtle that the warp is not readily apparent to the naked eye. If the valve has a noticeable ding at the edge such that it is clearly out of round, trying to chase and clean the threads won't work and you will have to replace the valve.

The DIN SCUBA valve outlet is British Standard Pipe Parallel "G" Series (BSPP) 5/8-inch DIA X 14 TPI with 55 degree pitch Whitworth thread form. Very few dive shops have the relatively expensive tapping tool needed to re-thread a DIN outlet; best practice says that valves with damaged threads should replaced because re-threading might remove too much material and weaken the connection.


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