Often there are a lot of questions regarding corrosion inhibitor military specifications.
For example Mil-C-16173
and the various optional components of the mil spec.
For this particular specification Mil-PRF-16173
has replaced Mil-C-16173 in many projects that formerly called for the latter specification C-16173. Therefore if the project calls for Mil-PRF-16173
then that is type of product that is required. If the project specifies Mil-C-16173E it is the same as Mil-PRF-16173E
This is because Mil-C-16173D was the last revision of the standard before it was replaced with Mil-PRF-16173
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