Nibco W00730D Reducing Copper Coupling with Stop

Product Description

The NIBCO W00730D is a reducing copper coupling with stop, designed for copper-to-copper sweat solder connections in residential and light commercial plumbing systems. The integrated stop prevents the pipe from seating too deep, ensuring consistent joint depth and reliable solder flow around the full circumference of the fitting. At 1/2 inch by 3/8 inch, this coupling transitions between two common tube sizes in a single fitting body, eliminating the need for additional reducers or adapters in tight spaces.

This fitting is used in potable water supply lines, hydronic heating distribution, and general copper tube systems where a size reduction is required inline. It is a standard choice for rough-in plumbing, remodel work, and repair applications. Plumbers working on residential fixtures, branch lines, and appliance supply connections will find this fitting sized for common last-leg transitions from 1/2 inch main runs down to 3/8 inch stub-outs.

Key Features

• Copper body construction for compatibility with copper tube systems and long service life
• Integrated stop ensures consistent insertion depth for repeatable, leak-free solder joints
• Sweat solder end connections suit standard torch and flux methods used by licensed plumbers
• Reducing configuration transitions 1/2 inch to 3/8 inch in a single compact fitting
• Lightweight at 0.033 pounds, minimizing added load in overhead or wall-cavity runs

Compatibility

Designed as an OEM-style replacement and new-installation fitting for copper tube plumbing systems using sweat solder joints.

Installation Notes

Installation is performed by a licensed plumber following applicable IPC or local plumbing code requirements. Shut off the water supply and fully drain the line before cutting and prepping the pipe ends. Clean all mating surfaces with emery cloth and apply a lead-free flux before heating with a propane or MAPP torch to flow solder. Allow the joint to cool completely before restoring system pressure and inspecting for leaks.

Technical Specifications

• Connection Type: Sweat Solder (Copper to Copper)
• Inlet Size: 1/2 inch
• Outlet Size: 3/8 inch
• Material: Copper
• Weight: 0.033 pounds
• UPC: 00039923037183

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: W00730D