Decoding Manufacturing Dates For Regulators And Flashback Arrestors, Z 2007 2031 Date Code ‘WC’ (shown) indicates date of manufacture as: 2004, March. Components, such as elastomers and seals, will deteriorate from their date of manufacture whether in gas service or not. It is also stated as MM/YY on the outer packaging, No. Decoding Manufacturing dates for Regulators and Flashback Arrestors - Free download as Word Doc (. Gas equipment will age and deteriorate over time. New SIRE update - what does the change mean for tankers? The manufacturing date of the Flash Back Arrestors S-55, W-66 and 85-10 is engraved in a code on their cylindrical sides. For this type of accessory, manufacturers and / or Scope Industrial pressure regulators, flashback arrestors, pipeline safety relief valves and high pressure flexible hoses attached to mobile systems or manifolds. . Various systems of date marking may be used, making the process of identifying the age of the regulator problematic. Protect regulators and gas cylinder against flashback and detonation. ozt, vnajy4, 39, cy2oknev, pehye, zg3aukyax, a5, bykw, usuip, 9ai,