The RKV4G37 pump is one of the widest used pumps in the industry for 11-15 hp engines. This Pump or its earlier versions were used by manufacturers like Excell, Devilbiss, Generac, Briggs & Stratton, Troy-Bilt, Sears, Craftsman,Campbell Hausfeld, Porter Cable, Karcher, Delta, Black & Decker, Dewalt and many others. The RKV4G37 Pump is a Triplex Plunger pump with a Forged Brass head for Maximum strength and longevity. The RKV4G37 also uses a 1 piece oversized connecting rod, Stainless Steel Rods and Super thick solid ceramic plungers to insure that the seals have a long life. We recommend the A.R. RKV4G37 as a great replacement pump for any engine 11-13 hp horizontal shafts.