id definition AAM Anhydrous Ammonia ACD Acid CEM Cement Discharge CRO Cross Link Polyethylene (Chemical-Solvent) FDA FDA Tube (Food Grade) GAL Galvanized Steel (Hot Asphalt and Tar) HOT Hot Air Blower LIQ Liquid Propane Gas NIR Nitrile Tube (Petroleum) NIT Nitrile Tube (Hot Asphalt and Tar) PUR Pure Gum Tube (Food Grade, Dry Bulk) SST Stainless Steel TEF Teflon (Fluorocarbon) VIT Viton (Fluoroelastomer)