Nylon plumbing fittings are an economical alternative to more costly bronze or Marelon fittings.For joining two hoses with the same inside diameter, these Nylon Hose Couplers cost less than similar fittings made of Marelon or Bronze, but are for above-the-waterline use only.Sizes 1/2", 5/8", 3/4", 1", 1 1/8", 1 1/2"Above-the-waterline use only