... 3 Reliable & long life 4 Convenient operation and maintenanc API M Front-mounted pumping unit adopts crank-balance. The special structure ... ,128,112456,0006M-320D-305-12030,500120,104,88320,0007M-228D-256-12025,600120,104,88228,0008M-228D-173-10017,300100,84 ... ,68228,0009M-160D-173-8617,30086,72,58160,000 API M Front ...