Not protecting the threads between cylinder threads and the valve threads can cause Galvanic Corrosion. This corrosion can seize a valve on a cylinder. It is important to protect the threads from corrosion. Read further to find why it happens.
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What is corrosion and what is the best protection for cylinders exposed to harsh environments?
a cylinder gets some visual inspection every five years, even though cylinders may be exposed to safety concerns countless times within a requalification period.