Ball bearing, 6201 2RS.

Air compressor pressure reducer (regulator). If air leaks from the regulator, or when you turn the knob it doesn't adjust the PSI up or down, replace this part.

(M6)

Air compressor piston seal (ring). Install with the concave side of the seal facing up. Note: This part is also available in the following kits: C710100ConrodKit A710100ConrodKit A810100ConrodKit A610101ConRodKit