
Watts AquaLock - Large Diameter Stackable Valve
Watts AquaLock Large Diameter Stackable Valve
Tubing & Thread Standards
AquaLock fittings connect to copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing. Polypropylene tubing sizes range from 3/8" OD (1/4" CTS) to 1-1/8" OD (1" CTS). National Pipe Thread (NPT) sizes span 1/4" through 2" NPT with corresponding outside diameters from 0.540" to 2.375". CTS refers to Copper Tube Size, NPT to National Pipe Tapered threads, and NPS to National Pipe Straight threads. The stackable design allows multiple connections in confined spaces without complex manifold assemblies.
Sizing Reference
| Polypropylene OD | Copper Tube Size (CTS) |
|---|---|
| 3/8" | 1/4" |
| 1/2" | 3/8" |
| 5/8" | 1/2" |
| 7/8" | 3/4" |
| 1-1/8" | 1" |
NPT Thread Sizing
| Actual OD (Inches) | NPT Thread Size |
|---|---|
| 0.540 | 1/4" |
| 0.675 | 3/8" |
| 0.840 | 1/2" |
| 1.050 | 3/4" |
| 1.315 | 1" |
| 1.660 | 1-1/4" |
| 1.900 | 1-1/2" |
| 2.375 | 2" |
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Watts AquaLock Large Diameter Stackable Valve
Tubing & Thread Standards
AquaLock fittings connect to copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing. Polypropylene tubing sizes range from 3/8" OD (1/4" CTS) to 1-1/8" OD (1" CTS). National Pipe Thread (NPT) sizes span 1/4" through 2" NPT with corresponding outside diameters from 0.540" to 2.375". CTS refers to Copper Tube Size, NPT to National Pipe Tapered threads, and NPS to National Pipe Straight threads. The stackable design allows multiple connections in confined spaces without complex manifold assemblies.
Sizing Reference
| Polypropylene OD | Copper Tube Size (CTS) |
|---|---|
| 3/8" | 1/4" |
| 1/2" | 3/8" |
| 5/8" | 1/2" |
| 7/8" | 3/4" |
| 1-1/8" | 1" |
NPT Thread Sizing
| Actual OD (Inches) | NPT Thread Size |
|---|---|
| 0.540 | 1/4" |
| 0.675 | 3/8" |
| 0.840 | 1/2" |
| 1.050 | 3/4" |
| 1.315 | 1" |
| 1.660 | 1-1/4" |
| 1.900 | 1-1/2" |
| 2.375 | 2" |


















