27 mm, Actual Outside Dia.
Buna-N O-Ring, 3mm Wide 21mm ID, PK50 Range -40 Degrees to 250 Degrees F, FDA Approved No, Properties Resistant to Oils, Resistant to Water, Application Standard 21 mm, Actual Width 3 mm, Color Black, Durometer 70 Shore A, Nominal Outside Dia. O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Metric, Cross Section Shape Round, O-Ring Material Buna N, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia.