Nibco CC03900 4 in Poly Schedule 80 Hex Plug Male Npt

Product Description

The NIBCO CC03900 is a 4-inch Schedule 80 polypropylene hex plug designed for closing off male-threaded pipe ends in industrial and commercial piping systems. Manufactured from black polypropylene, this hex plug offers solid chemical resistance and durability in demanding fluid-handling applications. The male NPT (MNPT) thread connection conforms to standard pipe thread dimensions, allowing straightforward installation into female-threaded fittings, valves, or pipe ends. At 0.66 pounds, the fitting is lightweight yet rated for the pressure demands of Schedule 80 service. Licensed plumbers and pipefitters are the primary installers of this component in process piping, chemical handling, and water distribution systems.

This hex plug is suited for residential, commercial, and light industrial applications where a threaded pipe end must be sealed or capped. Common install scenarios include system commissioning, pressure testing, and permanent pipe-end closure in Schedule 80 thermoplastic piping systems. The black polypropylene construction makes it appropriate for environments where corrosion resistance or chemical compatibility is a requirement, such as chemical processing lines, irrigation manifolds, and plumbing drain or vent systems.

Key Features

• 4-inch fitting size with male NPT (MNPT) end connection for standard threaded pipe compatibility
• Schedule 80 rating for higher-pressure service compared to Schedule 40 fittings
• Polypropylene construction provides resistance to a broad range of chemicals and corrosive fluids
• Black color finish standard for this material and pressure class
• Hex head design allows installation and removal with a standard pipe wrench or adjustable wrench
• Lightweight at 0.66 pounds, reducing load on threaded connections

Compatibility

Designed as an OEM-style replacement or direct-fit component for Schedule 80 thermoplastic piping systems using standard male NPT threaded connections.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter. Isolate and depressurize the system completely before threading any fitting into a live line. Apply a compatible thread sealant or PTFE tape to the male threads before installation, following the pipe manufacturer recommendations and applicable IPC or local plumbing code requirements. Do not overtighten polypropylene fittings, as excessive torque can crack the material.