John Deere Original Equipment Round Cross Section O-Ring - R183409 The part specifications for R183409: Part Number: R183409 Part Name: Round Cross Section O-Ring Inside Diameter(IN): 0.3010 Nominal Section(IN): 0.0700 Standard Number Code(ALPHA): A Standard Number Size(ALPHA): 011 Durometer(ALPHA): Material(ALPHA): H4C This R183409 Round Cross Section O-Ring fits various models.  This is an OEM John Deere part.