Dust caps are one-piece blind nuts used to protect threads and keep contamination from cylinder valves. CGA thread specifications are used, but they do not make a gas tight seal.
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Items
Dust Cap & Chain Assemblies CC-8021

Dust & Chain Assembly (Non-Gas Tight) for Fuel Gas
CC-8020

Dust & Chain Assembly (Non-Gas Tight) for Oxygen
Dust Cap & Chain Assemblies CC-8034

Dust & Chain Assembly (Non-Gas Tight) for Oxygen
Dust Cap & Chain Assemblies CC-8035

Dust & Chain Assembly (Non-Gas Tight) for Fuel Gas
Dust Cap & Chain Assemblies CC-8300

Dust & Chain Assembly (Non-Gas Tight) for Ethyl Chloride Acetylene
CGA Standard N/A 021 N/A 022 N/A 024 N/A 025 N/A 300
Application N/A Fuel Gas N/A Oxygen N/A Oxygen N/A Fuel Gas N/A Ethyl Chloride Acetylene
Material N/A Brass
Connection N/A "B" 9/16"-18-LH-INT N/A "B" 9/16"-18-RH-INT N/A "C" 7/8"-14-RH-INT N/A "C" 7/8"-14-LH-INT N/A .830"-14NGO-RH-INT
Part N/A Cap Chain