GX CS3 compressor

There is one wear part, and that is the seal.on the low pressure piston. A spare seal is included with the pump. 4 hex screws to remove the head to expose the piston. I have run mine 15 hours and have no noticable wear.

Do you have a CS3 already?

There is a check valve that can get gummed up with grease. That is a 5 minute job to remove, clean and replace.