Is anyone able to identify this pump? It's an aluminum 2 stage model. I have the owners manual and parts breakdown but I can't actually find anything on it. It's an older RK Machinery CA 560V-DS built in 1990. Ignore the Champion tank, I swapped it to replace the original tank that rusted out. Pump displacement is 22.1CFM and 16.9CFM at 90 PSI with a 5hp motor.