Copper Three-Way Shut-Off Valve for Reverse Osmosis & Water Supply Lines Upgrade your home plumbing with this precision-crafted copper three-way shut-off valve, designed for seamless integration with reverse osmosis (RO) systems, hot and cold water supply lines, and general household plumbing. Compatible with both 1/4" and 3/8" threaded connections, this versatile adapter makes it easy to control water flow with confidence and reliability. Why Choose This Copper Shut-Off Valve? Premium Copper Construction: Solid copper body offers exceptional durability, corrosion resistance, and long-lasting performance in both hot and cold water applications. Three-Way Design: Allows flexible water routing — control, divert, or shut off flow between multiple lines without additional fittings or adapters. Universal Fit: Threaded male connections in 1/4" and 3/8" sizes make this valve compatible with most standard RO systems, faucets, and water supply lines. Rated Up to 850 kPa: Built to handle typical household water pressures safely and reliably. Easy Installation: Straightforward threaded connection — no specialist tools required. Perfect for DIY plumbing upgrades and replacements. Versatile Application: Ideal for reverse osmosis water filtration systems, kitchen faucets, bathroom fixtures, refrigerator water lines, and more. Product Specifications Material: Copper Connection Type: Threaded (Male) Compatible Sizes: 1/4" and 3/8" Max Pressure: <850 kPa Application: Hot & Cold Water, Reverse Osmosis Systems, Household Plumbing High-Concern Chemicals: None Perfect For Reverse osmosis (RO) water filtration system installations Kitchen and bathroom faucet water supply connections Refrigerator and ice maker water line hookups General household plumbing maintenance and upgrades Related Products You May Like 1.5L Handheld Steam Cleaner Touch Screen 1800W | CE Certified 1.2L Smart Electric Dehumidifier with Remote & Anion Purifier Authoritative Resource For guidance on safe drinking water systems and plumbing standards, visit the U.S. Environmental Protection Agency (EPA) – WaterSense. Frequently Asked Questions Q: What sizes does this copper three-way shut-off valve fit? A: This valve is compatible with both 1/4" and 3/8" threaded (male) connections, making it suitable for most standard reverse osmosis systems, household faucets, and water supply lines. Q: Can this shut-off valve be used with both hot and cold water lines? A: Yes, the solid copper construction makes this valve suitable for use with both hot and cold water supply lines, up to a maximum pressure of 850 kPa. Q: Is this valve easy to install without a plumber? A: Absolutely. The standard threaded connection design allows for straightforward DIY installation using basic hand tools. Simply thread it onto your existing water supply line for a secure, leak-resistant fit. Q: Is this valve safe for use in drinking water or reverse osmosis filtration systems? A: Yes, the valve contains no high-concern chemicals and is made from solid copper, which is a widely accepted material in household plumbing and water filtration applications.