Mueller Streamline BUS00978 Copper Flush Bushing

Product Description

The MUELLER STREAMLINE BUS00978 is a copper flush bushing designed to reduce pipe connections from a 1/2-inch fitting (FTG) end to a 3/8-inch cup (C) sweat end. This fitting is used to transition between two different copper tube sizes within a plumbing or hydronic system. At 0.44 inches in length and 0.5 inches in height and width, it is a compact, low-profile reducer that installs cleanly inside existing fittings without adding significant stack height. Licensed plumbers and pipefitters install this type of bushing when connecting branch lines, appliance supply lines, or refrigeration tubing where a direct size reduction is required at the joint.

This flush bushing is suited for residential and light commercial plumbing, hydronic heating, refrigeration piping, and HVAC condensate or refrigerant line applications where copper sweat connections are standard. The FTG x C configuration allows the bushing to be inserted directly into a fitting socket, making it a space-efficient solution for in-line size reductions. It is appropriate for use in potable water systems, pressure lines, and other copper tube installations where ASME-rated components are required.

Key Features

• Flush design allows the bushing to seat inside a fitting socket without protruding
• 1/2-inch FTG inlet x 3/8-inch C outlet for a direct sweat-solder size reduction
• Compact profile: 0.44 inches in length, 0.5 inches in height and width
• Meets multiple ASME standards for cast and wrought copper fittings
• Lightweight at 0.01 pounds, suitable for tight or overhead installations

Compatibility

Designed as an OEM-style sweat copper reducing bushing for use in standard 1/2-inch FTG x 3/8-inch C copper fitting applications in residential and commercial plumbing and HVAC piping systems.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters using standard sweat-soldering tools including a torch, flux, and lead-free solder per local plumbing codes. Shut off and drain the water supply or depressurize the system completely before cutting into existing lines. Clean and deburr all mating surfaces before applying flux to ensure a leak-free joint. Follow local plumbing codes and ASME standards for material and solder compatibility in potable water or pressure applications.

Technical Specifications

• Connection Size: 1/2 inch x 3/8 inch
• Connection Type: FTG x C
• Actual Height: 0.5 inches
• Actual Length/Depth: 0.44 inches
• Actual Width: 0.5 inches
• Actual Weight: 0.01 pounds
• Standards/Compliance: ASME B16.15, ASME B16.18, ASME B16.22, ASME B16.24, ASME B16.50, ASME B1.20.1

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: BUS00978