Widely used to provide oxygen in aquariums, fish farms and hydroponic systems. Includes chrome air manifold, ranging from six to twelve outlets. Cylinders and pistons are made of premium materials, making the pump strong, durable. Convenient to operate without oil or much noise. All pumps now includes two different fittings. 728450 and 728455 comes with 1/4 in and 3/8 in fittings. 728457 and 728459 comes with 1/2 in and 3/8 in fittings.