Copper 3-Way Shut-Off Valve 1/4" & 3/8" | RO Water Adapter

Copper Three-Way Shut-Off Valve for Reverse Osmosis & Water Supply Systems

Upgrade your water filtration setup with this precision-forged copper three-way shut-off valve. Designed to fit both 1/4" and 3/8" threaded connections, this versatile adapter is ideal for reverse osmosis (RO) systems, hot and cold water lines, and general plumbing applications. The hexagon head design allows for easy tightening with standard tools, while the forged copper construction ensures long-lasting durability and reliable leak-free performance.

Key Features

• Material: Premium forged copper — corrosion-resistant and built for lasting durability
• Compatibility: Fits 1/4" and 3/8" threaded connections (male, equal shape)
• Three-Way Design: Allows simultaneous control of multiple water lines from a single valve
• Max Pressure Rating: <850 kPa — suitable for standard residential water supply systems
• Head Code: Hexagon — easy to install and tighten with a wrench
• Connection Type: Threaded — secure, no-slip fit for hot and cold water lines
• Application: Reverse osmosis systems, water purifiers, under-sink plumbing, butler/water supply adapters
• No High-Concern Chemicals: Manufactured without harmful substances for safe water delivery

Why Choose This Valve?

Whether you're installing a new reverse osmosis filtration system or replacing a worn shut-off valve in an existing setup, this three-way copper valve delivers the precision engineering your plumbing deserves. The forged copper body resists corrosion from both hot and cold water, making it a smart long-term investment for your home or office water supply.

Specifications

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For more information on safe drinking water systems and water filtration standards, visit the U.S. EPA Ground Water and Drinking Water resource.

Frequently Asked Questions

Q: What pipe sizes does this three-way copper shut-off valve fit?

A: This valve is designed to fit both 1/4" and 3/8" threaded connections, making it compatible with a wide range of standard reverse osmosis systems and water supply lines.

Q: Is this copper shut-off valve suitable for both hot and cold water?

A: Yes, the forged copper construction is rated for both hot and cold water lines, and the valve handles pressures up to 850 kPa, covering typical residential water supply pressures.

Q: How do I install this three-way valve on my RO system?

A: The hexagon head design allows you to use a standard wrench for installation. Simply thread the valve into your existing 1/4" or 3/8" connection points on your reverse osmosis or water supply adapter — no special tools required.

Q: Is the copper material safe for drinking water use?

A: The valve is manufactured without high-concern chemicals and is intended for use in drinking water supply systems. Copper is a widely accepted material for potable water plumbing fittings.