OEM Part No:393232, 299477Pipe Thread: 1"Fits Briggs & Stratton 11 hp, MTD 600 Rider. Fits models 233401, 233404, 233411, 233431, 233432, 233434, 233451, 233452, 233454, 233461, 243431, 243432, 243434, 243436, 243437, 243451, 243452, 243457, 300421, 300424, 301431, 301434, 302431, 302432, 302434, 302437, 326431, 326432, 326434, 326435, 326436, 326437.Length Outside Diameter412"Pipe OD: 1516" (33mm)