Asc Engineered Solutions 4X3D.NB Hex Head Bushing 150 Lb

Product Description

The ASC Engineered Solutions 4X3D.NB is a galvanized malleable iron hex head bushing designed to reduce a 4-inch NPS female thread down to a 3.5-inch NPS male thread. Rated at 150 lb, this bushing handles standard working pressures in threaded pipe systems used across plumbing, HVAC, and light industrial piping applications. The hex head profile allows secure wrench engagement during installation without damaging the fitting body. Domestic manufacture to NPS threading standards ensures consistent fit and thread engagement with standard NPT pipe fittings and valves.

This bushing is suited for residential and commercial pipe systems where a reduction between a 4-inch and 3.5-inch threaded connection is required. Typical applications include reducing threaded fittings in gas distribution, water supply, and steam or condensate lines operating within the 150 lb pressure class. The galvanized finish provides corrosion resistance in exposed or moderately wet environments. It is installed by licensed plumbers, pipefitters, and HVAC mechanics working on threaded iron pipe systems.

Key Features

• Reduces 4-inch NPS female thread to 3.5-inch NPS male thread
• 150 lb pressure class rating for standard threaded pipe service
• Malleable iron construction for durability and thread strength
• Galvanized finish for corrosion resistance in wet or exposed installations
• Hex head design allows full wrench engagement during makeup
• Domestic manufacture to NPS threading standards

Compatibility

Designed as an OEM-style replacement and standard fitting for 150 lb class threaded malleable iron pipe systems using NPS connections.

Installation Notes

Installation is performed by licensed plumbers or pipefitters working on threaded iron pipe systems. Shut off and depressurize the line before removing or installing any threaded fitting. Apply appropriate thread sealant or PTFE tape to the male threads per applicable IPC or IFGC requirements. Do not over-torque; use a pipe wrench sized for the fitting to avoid cracking the malleable iron body.

Technical Specifications

• Connection Size (Female): 4 inches NPS
• Connection Size (Male): 3.5 inches NPS
• Pressure Class: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Thread Standard: NPS
• Origin: Domestic

Standard Information

• Brand: ASC Engineered Solutions
• Manufacturer Part Number: 4X3D.NB