DGX HP Sealing DIN Plug
- Eliminates accidental gas leaks from your valves
- A true HP O-ring seal for 200-Bar and 300-Bar valves
- Perfect to protect $$ Trimix fills
- Travel and move filled tanks with confidence
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. 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.
The moment a DIN HP Plug is removed from the valve it seems to grow legs and walk away, so screw it into the first stage DIN cap from your regulator and secure it with the lanyard. If you discover you are unable to remove the plug by hand because it's being held in place by the pressure of the gas trying to escape then a dangerous condition exists, see the warning below for more information.
Most Helpful Customer Reviews
Nice machining and plating
on 11 July, 2018Well made; includes o-ring; great price. Superb customer support. Going to need a long 1 inch wrench to carefully remove the plug if your tank valve opens with the plugs in place.
Does what it's supposed to at a great price!
on 20 June, 2018I 'm now using these on all my valves with the exception of O2 bottles. Being nickel plated brass, they match the valve and are less likely to cause any galvanic action unlike the expensive SS plugs. As others have said, make sure to have a large wrench in your kit, you'll need it if you roll a valve on. Only thing I think could make these better is if they had a pressure relief valve on them.
on 31 December, 2017I am now using these exclusively on all of my tanks. I like keeping my O2 bottle sealed for safety, and safeguard against losing expensive fills of O2 and trimix.
On air or recreational nitrox fills, I remove the o-ring from the plug and use it to to protect the valves and keep out dust and bugs, but it won't pressurize and stick.
If you have the o-ring in and accidentally pressure it, it's not the end of the world. You just have to give it about a quarter turn with a 1 inch wrench to break the seal, but I wouldn't put my valves through the extra abuse over air or 32% etc.
Economical and does the job nicely.
on 5 June, 2017Really nice piece. Came with a plastic cap that can protect a DIN connection.
Finally a decent plug at a decent price
on 19 September, 2016Solid built, watertight and not going to become a rocket when you accidentally roll your valves.
We do NOT recommend the use of any type of HP sealing DIN Plug with oxygen rich gas mixtures, as impact or the friction of loosening the plug against high pressure oxygen could cause ignition, fire, and explosion leading to injury or death.
A dangerous condition exists if the plug has been pressurized by inadvertently opening the valve. No amount of force by hand will move it. First you MUST tightly close the valve, and only then you MUST loosen the plug with a wrench VERY SLOWLY and stand clear of the plug as you turn the plug in the valve. Make sure the plug is "aimed" at something able to withstand the force of ejection and no part of your body is in the path the plug might take if it is forcefully ejected. Back the plug out of the valve one full turn, but no more, this is enough to break the O-ring seal. Gas will gradually leak out around the threads until eventually the plug is loose enough to turn by hand, however even then we recommend continuing to use the wrench to turn the plug. If you do it slowly enough, you will hear a "hiss" and then a soft "pop" as the plug is ejected and falls to the floor.
If you find the plug and valve pressurized for no apparent reason and the valve is not found to be opened, it's very possible the valve has been leaking and the leak has been stopped by the plug. In this case, there is no quick way to remove the plug without extreme hazard because you are unable to determine the magnitude of the valve leak while the plug is in place. We recommend you take the cylinder to a cylinder hydrostatic testing facility for assistance removing the plug.