Nibco U34 3/4 Inch Black Union Pipe Fitting

Product Description

The NIBCO U34 is a 3/4 inch black union pipe fitting built for reliable performance in residential and commercial plumbing and heating systems. A union fitting allows two sections of pipe to be connected and disconnected without cutting or rotating the pipe itself. This makes it an essential component for any system that requires periodic servicing, valve replacement, or equipment removal. Plumbers and pipefitters rely on union fittings to save time during maintenance and repairs. The U34 is designed to work with water, oil, and glycol mix applications, making it well suited for hydronic heating systems, boiler connections, radiant floor heating, and general plumbing installations. The black finish indicates a malleable iron or steel construction, which provides strong, durable performance under pressure and temperature conditions found in heating and plumbing systems. The 3/4 inch size is one of the most commonly used pipe sizes in residential and light commercial work, fitting standard pipe runs for supply lines, heating loops, and equipment hookups. Threaded union connections follow NPT standards, allowing compatibility with standard black iron pipe fittings and a wide range of valves and components. Installers appreciate the three-piece design of a union fitting, which consists of a male end, a female end, and a union nut that draws the two ends together for a tight, leak-free seal. This design makes future disconnection straightforward and eliminates the need to disturb the surrounding pipe layout. The NIBCO U34 is a dependable choice for contractors, HVAC technicians, and plumbers who need a quality union fitting for black iron pipe systems.

• 3/4 inch black union fitting for threaded black iron pipe systems
• Compatible with water, oil, and glycol mix for plumbing and hydronic heating applications
• Three-piece union design allows easy disconnection for maintenance and equipment service

Product Highlights

The NIBCO U34 is a 3/4 inch black union fitting designed for threaded pipe systems in residential and commercial plumbing and heating applications. Its durable black iron construction and standard NPT threading make it a reliable, service-friendly component for hydronic and general plumbing installations.

Product Information

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: U34

Technical Specifications

• Pipe Size: 3/4 inches
• Connection Type: Threaded NPT Union
• Finish: Black
• Application: Water, Oil, Glycol Mix
• System Use: Residential and Commercial Plumbing, Hydronic Heating