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API’s Global Industry Services drives safety and efficiency within the oil and gas industry through standards, certifications, assessments, training and more.

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Step-by-Step Guide for DEF Applicants and Licensees

Products + Services / Diesel Exhaust Fluid (DEF) / Documents / Step-by-step guide for DEF applicants and licensees.

This document provides an array of step-by-step instructions and screenshots to assist the user with the online application system and license maintenance.