DIY plumbers and professionals, these WiseWater stop valves are seriously reliable! The pack of 5 gives you plenty for multiple projects or replacements around your home. Made from chrome-plated brass, they resist corrosion and handle temperatures up to 200°F with a 200 PSI rating - perfect for both hot and cold water lines. The 3/8 compression to 1/2 PEX connection works seamlessly with copper, PEX, or CPVC pipes from any brand. Installation is straightforward - no soldering or special tools needed, just use PEX crimp rings or stainless steel clamps (included!) with standard PEX tools. I've installed these under sinks, toilets, and appliances, and they've performed flawlessly with no leaks. The 1/4 turn operation is smooth and positive, making shut-offs quick and easy. They're NSF/ANSI/CAN 61 certified for potable water, so you can use them with confidence in drinking water systems. The chrome finish looks professional and cleans up easily. The included stainless steel clamp rings are quality too - no cheap, flimsy parts here. Whether you're doing new installations, repairs, or upgrades, these stop valves deliver professional-grade performance at a very reasonable price. They've become my go-to for all plumbing projects where reliable water control is essential.