Mueller Industries 520-602 Malleable Iron Tee 3/8 Fpt

Product Description

The MUELLER INDUSTRIES 520-602 is a straight tee fitting made from malleable iron with female pipe thread (FPT) connections on all three ports. Sized at 3/8 inches on each port and rated Class 150, this fitting is built for use in low-pressure piping systems carrying natural gas, LP gas, steam, lubricant oil, grease, or diesel fuel. The black finish is standard for malleable iron gas and steam pipe fittings. Plumbers, pipefitters, and HVAC technicians install this type of fitting when branching a run of threaded pipe into two directions without changing direction or reducing size.

This fitting is suited for residential and light commercial piping installations where a consistent 3/8-inch threaded branch is required. Common applications include gas supply lines, steam distribution systems, oil lubrication lines, and diesel fuel piping. All three FPT connections accept standard NPT male-threaded pipe, making it compatible with typical black iron pipe systems used throughout HVAC, plumbing, and industrial service work.

Key Features

• Straight tee configuration with equal 3/8-inch FPT ports on all three connections
• Class 150 pressure rating suitable for low-pressure gas, steam, and fluid service
• Malleable iron construction for strength and resistance to mechanical stress
• Black finish standard for gas and steam pipe fittings
• Rated for natural gas, LP gas, steam, lubricant oil, grease, and diesel applications
• NPT-compatible female threads on all three ports for standard black iron pipe

Compatibility

Designed as an OEM-style replacement or new-installation fitting for Class 150 malleable iron threaded piping systems using standard 3/8-inch NPT connections in gas, steam, oil, and fuel service.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified HVAC technician in accordance with applicable codes such as the IFGC for gas systems or ASME B31 for piping. Shut off and isolate the supply line and verify zero pressure before disassembling or connecting any threaded fittings. Apply an appropriate pipe thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Do not overtighten; use a pipe wrench with backup on adjacent fittings to avoid stressing the system.

Technical Specifications

• Material: Malleable Iron
• Finish: Black
• Connection Type: Female Threaded x Female Threaded x Female Threaded (FPT)
• Nominal Size: 3/8 inches x 3/8 inches x 3/8 inches
• Pressure Rating: Class 150
• Configuration: Straight Tee
• Application: Natural Gas, LP Gas, Steam, Lubricant Oil, Grease, Diesel

Standard Information

• Brand: MUELLER INDUSTRIES
• Manufacturer Part Number: 520-602