The Watts AquaLock Large Diameter Male Thread Union Tee delivers tool-free connections for copper, CPVC, PEX, and polyethylene tubing in reverse osmosis and water filtration installations. This push-to-connect fitting with male NPT threading eliminates the need for soldering, gluing, or crimping while maintaining a secure, leak-resistant seal.

SPECIFICATIONS

Watts AquaLock Male Thread Union Tee Details

Manufacturer	Watts Water Technologies
Product Line	AquaLock Push-to-Connect Fittings
Fitting Type	Male Fixed Union Tee
Connection Method	Push-to-connect with male NPT thread
Compatible Tubing	Copper, CPVC, PEX, LDPE, MDPE, HDPE, Polypropylene
Thread Standards	NPT (National Pipe Tapered Thread)
Available Sizes	1/4" through 2" NPT with corresponding tubing OD
Material	Engineering-grade polymer body

INSTALLATION & USE

How to Install AquaLock Union Tees

Cut tubing square using a proper tube cutter and ensure the end is clean, deburred, and free of scratches or damage.
Mark the tubing insertion depth using the depth indicator on the fitting body to confirm full seating during installation.
Push the tubing firmly into the AquaLock fitting until it bottoms out, then tug gently to verify the collet has engaged and locked the tube in place.
Thread the male NPT connection hand-tight into the corresponding female port, then tighten an additional 1 to 1.5 turns using a wrench while supporting the fitting body.
Pressurize the system slowly and inspect all connections for leaks before placing the installation into service.

COMPATIBILITY

Tubing & Thread Size Reference

AquaLock fittings accommodate polypropylene tubing sizes from 3/8" OD (1/4" CTS) through 1-1/8" OD (1" CTS), with male NPT thread sizes ranging from 1/4" NPT (0.540" OD) to 2" NPT (2.375" OD). This union tee configuration is ideal for creating branch connections in reverse osmosis systems, whole-house filtration manifolds, and commercial water treatment installations where toolless assembly and disassembly are required for maintenance access.

🔧 Pro tip: When working with LLDPE or soft polyethylene tubing, insert a tube support liner into the tubing end before pushing into the AquaLock fitting to prevent collapse under compression and ensure a proper seal against the O-ring.

Watts AquaLock - Large Diameter Male Thread Union Tee