Sterling diesels offer diesel injection feed pump, copper washers. The company claims to offer bounded dowdy seals as per dowty sizes from `4" bsp to 21/2 bsp sizes sterling diesels specializes in fuel injection pump components and copper washers. The company claims to be a leading stockists, manufacturer and exporter of diesel fuel injection pumps, spares and accessories of tata, leyland, bedford, volvo, mahindra & mahindra, etc., other than the feed pump assembly of all vehicles, according to the company, it specializes in manufacturing all sizes of copper washer from 4 mm to 400 mm od sizes. Quality is as per isi din sizes.. This, in addition to hydraulic washers that come in wbps to 21/2" bsp size as per the bsp standard. According to the company, it also deals in non-ferrous and ferrous washers and hydraulic fittings, o-rings and pneumatic fittings.