Castair CLB1212 — 1/2" x 1/2" Inline Check Valve, NPT Female Inlet/Outlet
The CLB1212 is a 1/2-inch by 1/2-inch NPT female inline check valve from Castair. It is the most common size in the Castair CLB inline check valve series — matching the 1/2-inch line size found in most garage and small commercial shop air systems. One-way flow in, automatic check on backpressure, female NPT threads on both ends.
Use the CLB1212 wherever you need to prevent compressed air from flowing backward in a 1/2-inch line: between a compressor pump and the receiver tank, at branch points in multi-zone systems, or in any configuration where maintaining one-way flow is critical to system integrity or safety.
What This Unit Does
- One-Way Flow Control: Air flows through in the intended direction. When upstream pressure drops, the check closes automatically and holds downstream pressure.
- 1/2" NPT Female Both Ends: Thread male nipples or fittings into each port — no special adapters needed for standard 1/2-inch pipe installations.
- Inline Body: Straight-through design installs directly in the pipe run without offset.
Castair Inline Check Valve Lineup (CLB Series)
- CLB1414 (1/4" x 1/4"): NPT Female — light-duty and control lines
- CLB1212 (1/2" x 1/2"): NPT Female — garage and small shop systems
- CLB3434 (3/4" x 3/4"): NPT Female — mid-size commercial
- CLB1010 (1" x 1"): NPT Female — large main lines
- CLB112112 (1-1/2" x 1-1/2"): NPT Female — industrial high-volume
Technical Specifications
- Part Number: CLB1212
- Inlet Size: 1/2" NPT Female
- Outlet Size: 1/2" NPT Female
- Body Style: Inline — straight-through
- Connection Type: NPT Female both ends
- Series: CLB Inline Check Valve
- Manufacturer: Castair, Spicer, Minnesota
Why Buy From Air Compressor Factory Direct?
We have sold Castair air system components since 2016. Call 866-217-0063 to confirm the right check valve for your system configuration. Free shipping on qualifying orders, full manufacturer warranty, free technical support.
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