John Guest ProLock 1/2″ CTS ( Copper Tube Size) Push-to-Connect Tee – Quick Connect Plumbing Fitting
PART PSEI0220E
Make plumbing connections faster and easier with the John Guest ProLock™ 1/2″ CTS Push-to-Connect Tee. Built to work with PEX, PE-RT, CPVC, and copper tubing, this versatile tee fitting lets you join pipes in seconds — no solder, glue, or clamps required.
The Twist-to-Lock™ feature adds an extra layer of security, while the stainless steel collet teeth and O-ring seal deliver a strong, leak-proof hold. Whether you’re working on a water softener installation, filtration system, or general plumbing repair, this ProLock fitting provides a reliable, code-approved solution you can trust.
Engineered for both residential and commercial use, ProLock fittings are designed for behind-the-wall installations, tight spaces, and even wet line repairs. Plus, they’re UV-stabilized, making them safe for outdoor applications.
Key Benefits
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Quick & Tool-Free Installation – Push-to-connect design cuts install time by 40%+
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Twist-to-Lock Security – Audible click and visual guide ensure a secure fit
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Multi-Material Compatibility – Works with PEX, PE-RT, CPVC, and copper tubing
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Reliable Performance – Stainless steel teeth and O-ring seal prevent leaks
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Approved for Permanent Use – Safe for behind-the-wall and concealed installations
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Reusable Design – Easily disconnects without damaging tubing
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UV Stabilized – Suitable for outdoor use
Performance Ratings
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160 PSI @ 73°F
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100 PSI @ 180°F
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80 PSI @ 200°F
Ideal Applications
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Water softener and conditioner systems
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Filtration and reverse osmosis setups
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Residential and commercial plumbing repairs
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OEM installations and retrofits