Asc Engineered Solutions 4X3.NB Hex Head Pipe Bushing

Product Description

The ASC Engineered Solutions 4X3.NB is a hex head pipe bushing designed to reduce a 4-inch pipe connection down to a 3-inch fitting. Manufactured from cast iron with a galvanized finish, this bushing features a male NPT (MNPT) inlet and a female NPT (FNPT) outlet, allowing straightforward inline pipe size reduction. Rated at 125 lb, it meets standard pressure requirements for plumbing, gas distribution, and industrial piping systems. The hex head design provides flat wrench surfaces for controlled installation torque. This is a domestic-made fitting intended for installation by licensed plumbers and pipefitters.

This bushing is used in residential and commercial piping systems where a 4-inch line must be stepped down to a 3-inch branch or outlet. Common applications include water supply lines, gas distribution headers, fire protection piping, and general industrial process piping. The galvanized cast iron construction makes it suitable for both above-ground and certain exposed indoor installations where corrosion resistance is required. The MNPT x FNPT end configuration threads directly into standard NPT-tapped fittings and valves without adapters.

Key Features

• Reduces 4-inch nominal pipe to 3-inch nominal fitting in a single threaded connection
• MNPT x FNPT end style for direct NPT system integration
• 125 lb pressure class cast iron construction
• Galvanized finish provides corrosion resistance for indoor and exposed installations
• Hex head exterior allows secure wrench engagement during installation
• Domestically manufactured fitting

Compatibility

Designed as an OEM-style replacement or new-installation fitting compatible with standard 4-inch x 3-inch NPT cast iron and galvanized piping systems rated at 125 lb class.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC codes. Shut off and depressurize the pipe system completely before removing or installing any threaded fittings. Apply an appropriate thread sealant or PTFE tape to the male threads before makeup, and tighten using a pipe wrench on the hex head flats. Do not over-torque cast iron fittings, as the material is not ductile and can crack under excessive force.

Technical Specifications

• Nominal Size: 4 x 3 inches
• End Style: MNPT x FNPT
• Pressure Rating: 125 lb
• Material: Cast Iron
• Finish: Galvanized
• Head Style: Hex Head
• Origin: Domestic

Standard Information

• Brand: ASC Engineered Solutions
• Manufacturer Part Number: 4X3.NB