Nibco CC03700 Hex Plug 1-1/4 in Polypropylene Schedule 80 Mpt

Product Description

The NIBCO CC03700 is a Schedule 80 polypropylene hex plug designed to seal male pipe thread (MPT) openings in plastic piping systems. Sized at 1-1/4 inches, it provides a reliable, pressure-rated mechanical seal in drainage, chemical, and industrial fluid systems where corrosion resistance is essential. The black polypropylene construction offers strong resistance to a wide range of chemicals, making it suitable for demanding service environments. Licensed plumbers and pipefitters install this fitting as part of pipe pressure testing, system capping, or permanent line termination. Its hex-head profile allows for wrench tightening to achieve a secure, leak-free seal on threaded connections.

This hex plug is intended for use in Schedule 80 plastic piping systems where MPT end connections are required. It is commonly installed in residential and light commercial plumbing, industrial chemical distribution lines, and process piping. The 1-1/4 inch size fits standard NPT-threaded outlets on Schedule 80 pipe and fittings. It is well-suited for applications requiring corrosion resistance or where metal fittings would be inappropriate due to chemical exposure or galvanic concerns.

Key Features

• Schedule 80 pressure rating for use in demanding piping applications
• Polypropylene construction provides resistance to corrosion and many chemicals
• MPT end connection allows wrench-tightened installation onto female-threaded fittings or pipe ends
• Hex head profile enables standard wrench or socket installation
• Black color consistent with Schedule 80 plastic fitting standards
• Lightweight at 0.18 pounds — easy to handle and stock

Compatibility

Designed as an OEM-style replacement or new-installation fitting for Schedule 80 plastic piping systems using 1-1/4 inch NPT threaded connections.

Installation Notes

This fitting is installed by licensed plumbers or pipefitters working on plastic piping systems. Depressurize and drain the line before removing or installing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the male threads before installation; do not overtighten, as polypropylene threads can crack under excessive torque. Installation should conform to applicable local plumbing codes and ASTM standards for thermoplastic piping systems.