Viega 87420 Propress 3-way Mixing and Diverting Valve 1/2 Inch Model 2976.3

Product Description

The Viega 87420 is a ProPress three-way mixing and diverting valve designed for professional plumbing and hydronic systems. It carries the Model 2976.3 designation and is manufactured in a 1/2 inch size. This valve gives plumbers and mechanical contractors precise control over flow direction and temperature blending in closed-loop systems. It can function as either a mixing valve or a diverting valve depending on how it is installed, making it a flexible component for radiant heating, chilled water, and other hydronic applications.

The body is constructed from brass, which provides strong corrosion resistance and long service life in demanding environments. The press connection components are made from silicon bronze, a material well suited for press-fit plumbing systems. The sealing elements are EPDM, a rubber compound known for its durability and compatibility with water-based systems. Viega ProPress technology means no open flame is required during installation. Press connections are made with a standard ProPress tool, reducing installation time and eliminating torch-related fire risks on the job site.

Smart Connect Technology is integrated into the EPDM sealing elements. This feature allows an unpressed fitting to be identified during pressure testing because the system will not hold pressure at an unsealed connection. This reduces the chance of a missed press being buried behind a wall or ceiling. The valve ships complete with Viega ProPress tailpieces and a flat EPDM gasket. The male BSP thread configuration is standard. Note that this valve is not rated for potable water installations or fuel gas applications. It is intended for closed hydronic and non-potable fluid systems only. HVAC technicians, plumbing contractors, and mechanical installers working on hydronic heating and cooling loops will find this valve a reliable and code-compliant solution.

• Three-way design supports both mixing and diverting configurations in a single valve body
• Viega ProPress press-fit connections eliminate the need for open-flame soldering during installation
• Smart Connect Technology EPDM seals allow unpressed fittings to be detected during pressure testing

Product Highlights

The Viega 87420 ProPress 3-Way Valve offers brass construction, silicon bronze press components, and Smart Connect EPDM sealing technology for fast, reliable installation in professional hydronic and closed-loop plumbing systems. It is not intended for potable water or gas applications.

Product Information

Standard Information

• Brand: VIEGA
• Manufacturer Part Number: 87420

Technical Specifications

• Model: 2976.3
• Size: 1/2 inch
• Body Material: Brass
• Press Material: Silicon Bronze
• Seal Material: EPDM
• Overall Length (L): 5.98 inches
• Dimension A: 4.33 inches
• Dimension H1: 2.38 inches
• Height: 4.870 inches
• Connection Type: Male BSP
• Technology: Smart Connect
• Application: Hydronic and closed-loop non-potable systems