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 and durable. Convenient to operate without oil or much noise. All pumps now includes two different fittings. SQ0716547 and SQ8777897 comes with 1/4 in and 3/8 in fittings. SQ3983197 and SQ3462514comes with 1/2 in and 3/8 in fittings.