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The imperviousness of the ORFS adapters is ensured not only by the thread, but also by a flat surface with a seat that accommodates an O-Ring (made of a nitrile compound which is suitable for temperatures between -20°C and +120°C) which guarantees a completely tight seal.
This particular product provides extreme resistance to depressions, pressure and tight clamping as well as preventing leakage (even in the presence of gas) and being easy to mount.
It can be mounted and dismantled time and time again, and the O-Ring can be replaced in the event of wear & tear or ageing.