1-1/2 inch x Close Brass Nipple

1-1/2" x Close Brass Pipe Nipple – NPT Threaded, Lead-Free

The 1-1/2" x Close brass pipe nipple is a fully threaded fitting used to connect two female-threaded components in piping systems requiring corrosion resistance, pressure durability, and code compliance. Manufactured from lead-free brass, this component meets federal and state regulations for use in potable water systems and general-purpose plumbing assemblies.

Close nipples are defined by minimal length between thread start points, providing the shortest possible connection between fittings or pipe sections. Threads are machined to ANSI B1.20.1 standards for NPT compatibility, ensuring a secure and leak-resistant seal when properly installed.

Technical Specifications

• Nominal Size: 1-1/2" NPT
• Length: Close (approximately 1.75" overall, fully threaded)
• Material: Lead-free brass (compliant with ASTM B62 / NSF 61 & 372)
• Thread Type: NPT male x NPT male (ANSI B1.20.1)
• Temperature Rating: Up to 250°F
• Pressure Rating: Typically rated to 200–300 psi (depending on system and configuration)

Installation Guidelines

Thread sealant or PTFE tape must be applied to male threads before installation to ensure a watertight joint. Brass threads must not be over-tightened to prevent thread damage or distortion. Due to the close-thread design, tools should be applied to adjacent fittings rather than directly to the nipple to avoid damaging threads or the pipe body.

Common Applications

This brass nipple is used in residential, commercial, and industrial systems where corrosion resistance and lead-free compliance are required. Common applications include water heater installations, potable water supply lines, pump connections, and manifolds. It is suitable for both hot and cold water systems and can be used in hydronic heating and low-pressure air applications.

Material and Compliance Notes

Lead-free brass nipples are required under the Safe Drinking Water Act for all potable water systems in the U.S. This fitting complies with NSF/ANSI 61 and 372, making it suitable for use in municipal and state-regulated plumbing installations. Its corrosion resistance and mechanical strength also make it preferred in locations with aggressive water chemistry.