Jamshedji Construction Machinery Co. Offers Double Roller Transit Mixer. Jamshedji Construction Machinery Co. Is an ISO 9001: 2008 accredited company supplying a wide range of construction machines like pumps, mixers, cutters, rollers, rammers and vibrators. The Double Roller Transit Mixer is available with a diameter size of 2200 mm and a water tank of 400 litres capacity. The Double Roller Transit Mixer provides a water pump pressure of 3 bar and has a filling ratio of 59 %.