GF Piping Systems PVC Pipe Fitting, Close Nipple, Schedule 80, Gray, 4" NPT Male, 2-7/8" Length Close nipple fitting for connecting two threaded pipes Male NPT threads on both ends for connecting pipes with female NPT threaded ends PVC for chemical and corrosion resistance, high strength, and less weight than fittings made from metal Operating temperature range of 0 to 60 degrees C (32 to 140 degrees F) Meets ASTM D1784 and D1785 standards for quality assurance, and meets NSF standards 14 and 61 for potable water service