Cylinder Assembly / Partner 506 09 92-12Pack Size:1Husqvarna 506 24 37-15, Partner 506 09 92-12HL Supply R6010465, Rotary 9640Partner K650 and 700 Active I, II and IIIBore: 50 mm, Coating: Chrome, Includes: Piston, rings, pin and clips, Ethanol: Not compatible with greater than 10% ethanol fuel