Use Brass Reducing Hex Head Bushings to securely connect one NPT size fitting to a smaller NPT size fitting.The brass fittings that we offer are for above-the-waterline use only. Due to the difference in nobility between brass and bronze, which can result in galvanic corrosion (and a failure of the fitting), we recommend that you not use these alloys together in saltwater environments. For reasons of safety, we suggest the use of cast bronze or Marelon tailpieces and hose instead.Reducing Hex Head BushingsThese machined brass bushings feature male NPT threads on one end and female NPT threads on the other. A hexagonal head allows for tighting with a wrench. Threads are tapered "NPT", which stands for "National Pipe Thread."