After reading some older posts I think the seal may be bad in my AAZ rotary pump. I only can hold 5" vacuum at idle and it does not go up much when I rev up. Oil pressure is low also. What is this seal --an actual oil seal or an O ring. Can some one furnish the size or part number. Am I going to be able to find this at any parts store or special order from someone? Are there rebuild kits for these pumps or just order a new one? I think Parts Place, Inc has them for $250. I have the old diaphragm style for the 1.6 but I don't think they will interchange.