Sea Tech 0959475 AquaLock 1/2" CTS Plastic Check Valve

The Sea Tech 0959475 (also branded as Watts AquaLock 3540-10) is a reliable 1/2" CTS plastic check valve designed to prevent backflow in marine, RV, and residential plumbing systems. Constructed from durable polysulfone thermal plastic material, this check valve ensures uni-directional flow to maintain system integrity and prevent reverse water flow.

Key Features:

• 1/2" CTS (Copper Tube Size) quick-connect connections on both ends
• Push-to-connect design requires no tools, inserts, or special equipment for installation
• Compatible with copper, CPVC, PEX, LPDE, MPDE, HDPE, and polybutylene tubing
• Polysulfone construction rated for 250 PSI at 75°F and 100 PSI at 180°F
• Operating temperature range from vacuum to 180°F maximum
• Zero-leak O-ring guide feature ensures reliable, leak-free connections
• Outside connection design increases flow capacity by over 30% compared to barb fittings
• Tubing can swivel even under maximum pressure after connection
• Suitable for hot and cold water applications
• Lead-free certified to ANSI, NSF, and ASTM standards
• Backed by a 25-year limited warranty

The AquaLock quick-connect system features stainless steel gripping teeth in the collet that provide corrosion-resistant, secure connections across multiple tubing materials. Ideal for marine applications including potable water systems, fresh water washdown, live wells, and windshield washing systems, as well as RV and residential plumbing installations. This check valve helps maintain pump prime and prevents backflow in pressure water systems.