The OMS DIN Valve/Gas Protector prevents gas loss from leaks and also protects the DIN valve orifice from deformation during handling and transportation. It is made from stainless steel, is oxygen clean and includes a Viton O-ring.
The OMS HP Sealing DIN Plug provides a true O-ring seal in both 200-Bar and 300-Bar valves which maintains your gas supply if the cylinder valve ON/OFF knob is accidentally turned on. 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.
The moment a S/S 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, close the valve and break the seal by loosening the plug with a wrench.
Note: The image shows how the protector is used with a DIN valve. The illustrated valve is not included.
What Happened to My Gas?
Missing a dive because of lost gas is a very annoying experience, and it's often blamed on a short fill. The more likely reason is a gas leak caused by carrying a cylinder with the hand-wheel and allowing the valve to be inadvertently opened slightly. This typically occurs when the cylinder is being lifted up into a vehicle or tank rack, or when the cylinder shifts during transport and the hand-wheel is rubbed open.
We also regularly see leaking neck O-rings and even leaking burst disk assemblies. Leaks through the valve seat are rare but do happen with very old and worn valves. Sometimes leaks are so slow that the hiss of gas escaping can't even be heard. Often with such tiny leaks the pressure will drop a few hundred PSI and the leak will stop, but the cylinder almost never leaks until it is completely empty; thus the appearance of a short fill.
Leaks from the valve outlet can be prevented by meticulously double checking the valve is closed whenever you move a cylinder. Leaks from the neck or burst disk assembly can only be prevented by regular maintenance of your valve. When your cylinder and valve receive their annual visual inspection make sure the O-ring groove in the neck is cleaned and a new clean and unlubricated neck O-ring installed.