The 360-80301-00 Mahle DOT Cylinder 30 Lb. R134a 1/2" ACME is a standard “re-usable” DOT container for R134a. Has 1/2 in. ACME connections. This unit DOES NOT HAVE OVERFILL PROTECTION - an Electronic Weight Scale is recommended as additional accessory to avoid over-filling or a float can be purchased and installed.