Groco Bronze Pipe Nipple Grocos PN Series cast bronze pipe nipples provide exact alloy compatibility for making inter-connections between numerous marine components such as seacocks, strainers, and check valves. A cast-in wrench flat simplifies installation and removal Full flow NPT x NPT connection C83600 Bronze construction Note C83600 bronze fittings are not in compliance with NSF-61 and therefore are not intended for use in potable water systems. Specifications Part Number Thread NPT A B C W