The Watts AquaLock Large Diameter Union Check Valve prevents backflow in residential and commercial water filtration systems with a reliable, tool-free connection design. Compatible with copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing across a wide range of pipe sizes from 1/4" to 2" NPT.
SPECIFICATIONS
Watts AquaLock Check Valve Core Specs
Brand
Watts Water
AquaLock series
Product Line
AquaLock
Union check valve
Valve Type
Check Valve
Prevents backflow
Connection
Large Diameter
Tool-free union design
Material
Engineered Polymer
Corrosion resistant
Application
Residential & Commercial
Universal fitting
TECHNICAL DETAILS
Polypropylene Tubing Compatibility
3/8" OD Polypropylene
1/4" CTS Copper Tube Size (ID)
1/2" OD Polypropylene
3/8" CTS Copper Tube Size (ID)
5/8" OD Polypropylene
1/2" CTS Copper Tube Size (ID)
7/8" OD Polypropylene
3/4" CTS Copper Tube Size (ID)
1-1/8" OD Polypropylene
1" CTS Copper Tube Size (ID)
PIPE THREAD REFERENCE
NPT Thread Sizing Guide
0.540" OD Actual
1/4" NPT Thread Size
0.675" OD Actual
3/8" NPT Thread Size
0.840" OD Actual
1/2" NPT Thread Size
1.050" OD Actual
3/4" NPT Thread Size
1.315" OD Actual
1" NPT Thread Size
1.660" OD Actual
1-1/4" NPT Thread Size
1.900" OD Actual
1-1/2" NPT Thread Size
COMPATIBILITY & APPLICATIONS
Tubing and Connection Options
The Watts AquaLock Large Diameter Union Check Valve connects seamlessly to copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing systems. The union design allows for tool-free installation and maintenance access in reverse osmosis systems, water filtration lines, and residential plumbing applications where backflow prevention is required. CTS sizing references Copper Tube Size based on inside diameter, while NPT refers to National Pipe Tapered thread standards for male or female threaded connections. This check valve is designed for integration with SeaTech and other push-to-connect fitting systems commonly used in point-of-use water treatment.
💧 Pro Tip: Check valves should always be installed with flow direction matching the arrow on the valve body. Watts AquaLock fittings eliminate the need for clamps or crimping tools, but verify tubing is fully seated to the insertion depth mark before pressurizing the system.
The Watts AquaLock Large Diameter Union Check Valve prevents backflow in residential and commercial water filtration systems with a reliable, tool-free connection design. Compatible with copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing across a wide range of pipe sizes from 1/4" to 2" NPT.
SPECIFICATIONS
Watts AquaLock Check Valve Core Specs
Brand
Watts Water
AquaLock series
Product Line
AquaLock
Union check valve
Valve Type
Check Valve
Prevents backflow
Connection
Large Diameter
Tool-free union design
Material
Engineered Polymer
Corrosion resistant
Application
Residential & Commercial
Universal fitting
TECHNICAL DETAILS
Polypropylene Tubing Compatibility
3/8" OD Polypropylene
1/4" CTS Copper Tube Size (ID)
1/2" OD Polypropylene
3/8" CTS Copper Tube Size (ID)
5/8" OD Polypropylene
1/2" CTS Copper Tube Size (ID)
7/8" OD Polypropylene
3/4" CTS Copper Tube Size (ID)
1-1/8" OD Polypropylene
1" CTS Copper Tube Size (ID)
PIPE THREAD REFERENCE
NPT Thread Sizing Guide
0.540" OD Actual
1/4" NPT Thread Size
0.675" OD Actual
3/8" NPT Thread Size
0.840" OD Actual
1/2" NPT Thread Size
1.050" OD Actual
3/4" NPT Thread Size
1.315" OD Actual
1" NPT Thread Size
1.660" OD Actual
1-1/4" NPT Thread Size
1.900" OD Actual
1-1/2" NPT Thread Size
COMPATIBILITY & APPLICATIONS
Tubing and Connection Options
The Watts AquaLock Large Diameter Union Check Valve connects seamlessly to copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing systems. The union design allows for tool-free installation and maintenance access in reverse osmosis systems, water filtration lines, and residential plumbing applications where backflow prevention is required. CTS sizing references Copper Tube Size based on inside diameter, while NPT refers to National Pipe Tapered thread standards for male or female threaded connections. This check valve is designed for integration with SeaTech and other push-to-connect fitting systems commonly used in point-of-use water treatment.
💧 Pro Tip: Check valves should always be installed with flow direction matching the arrow on the valve body. Watts AquaLock fittings eliminate the need for clamps or crimping tools, but verify tubing is fully seated to the insertion depth mark before pressurizing the system.
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From $4.54
Original: $12.97
-65%
Watts AquaLock - Large Diameter Union Check Valve—
$12.97
$4.54
Description
The Watts AquaLock Large Diameter Union Check Valve prevents backflow in residential and commercial water filtration systems with a reliable, tool-free connection design. Compatible with copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing across a wide range of pipe sizes from 1/4" to 2" NPT.
SPECIFICATIONS
Watts AquaLock Check Valve Core Specs
Brand
Watts Water
AquaLock series
Product Line
AquaLock
Union check valve
Valve Type
Check Valve
Prevents backflow
Connection
Large Diameter
Tool-free union design
Material
Engineered Polymer
Corrosion resistant
Application
Residential & Commercial
Universal fitting
TECHNICAL DETAILS
Polypropylene Tubing Compatibility
3/8" OD Polypropylene
1/4" CTS Copper Tube Size (ID)
1/2" OD Polypropylene
3/8" CTS Copper Tube Size (ID)
5/8" OD Polypropylene
1/2" CTS Copper Tube Size (ID)
7/8" OD Polypropylene
3/4" CTS Copper Tube Size (ID)
1-1/8" OD Polypropylene
1" CTS Copper Tube Size (ID)
PIPE THREAD REFERENCE
NPT Thread Sizing Guide
0.540" OD Actual
1/4" NPT Thread Size
0.675" OD Actual
3/8" NPT Thread Size
0.840" OD Actual
1/2" NPT Thread Size
1.050" OD Actual
3/4" NPT Thread Size
1.315" OD Actual
1" NPT Thread Size
1.660" OD Actual
1-1/4" NPT Thread Size
1.900" OD Actual
1-1/2" NPT Thread Size
COMPATIBILITY & APPLICATIONS
Tubing and Connection Options
The Watts AquaLock Large Diameter Union Check Valve connects seamlessly to copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing systems. The union design allows for tool-free installation and maintenance access in reverse osmosis systems, water filtration lines, and residential plumbing applications where backflow prevention is required. CTS sizing references Copper Tube Size based on inside diameter, while NPT refers to National Pipe Tapered thread standards for male or female threaded connections. This check valve is designed for integration with SeaTech and other push-to-connect fitting systems commonly used in point-of-use water treatment.
💧 Pro Tip: Check valves should always be installed with flow direction matching the arrow on the valve body. Watts AquaLock fittings eliminate the need for clamps or crimping tools, but verify tubing is fully seated to the insertion depth mark before pressurizing the system.
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