Boston diesel oil purifier series are jointly developed by United States pre-filter Boston Co., Ltd and our tianhou group, which is mainly applied to various fishing boats or other equipment powered by diesel fuel engine of low and medium power below 1000HP. This new invention is used for filtering more than 90% harmful impurities for diesel engine; guarantee providing cleaner diesel fuel for your diesel engine, attain the aims of protecting diesel engine and saving oil. This product is different from the existed diesel filter in our market, which can not be installed directly on the diesel engine body. Boston diesel oil purifiers should be installed on the oil supply tube between the oil tank and diesel filter. In China, the product has been applied to multiple companies running oil field large equipment, truck, fishery harbors diesel engine, ect, and gained surprising achievements and praise from clients.