Brass Ball Valve Air Compressor Pipe Fittings — NPT 1/4" 3/8" 1/2" 3/4"

Match the valve thread size to your compressor's outlet port. Most portable air compressors use 1/4" NPT ports, while larger shop compressors typically use 3/8" or 1/2" NPT. Check your compressor's manual or measure the port diameter — 1/4" NPT is approximately 0.54" (13.7mm) outer diameter on the male thread. When in doubt, size up rather than down to avoid restricting airflow.

Brass ball valves of this type are generally rated for working pressures up to 200 PSI (approximately 13.8 bar) at ambient temperatures, which is sufficient for most air compressor applications. Contact us to confirm the exact pressure rating for your specific size before use in high-pressure systems.

Brass has naturally good corrosion resistance and is generally suitable for outdoor and humid workshop environments. However, prolonged exposure to saltwater or highly acidic conditions may accelerate surface wear. For marine or coastal applications, consider additional protective measures or consult us for material recommendations.

Yes. These fittings use standard NPT (National Pipe Taper) threads, which are the most common thread standard for air compressor plumbing in the United States. They are compatible with most US-standard air hoses, compressors, and pneumatic tools. BSP or metric thread systems are not compatible without an adapter.

Yes — applying PTFE (Teflon) thread tape to the male threads before assembly is strongly recommended for NPT fittings. This ensures a leak-free seal and makes future disassembly easier. Wrap the tape clockwise 2–3 times around the male thread before threading in. Do not overtighten; hand-tight plus 1–2 turns with a wrench is typically sufficient.

Choose based on the thread types on both sides of your connection point. Female-to-Male (F×M) is the most common and works as an inline shutoff between a male-threaded port and a female-threaded hose. Female-to-Female (F×F) connects two male-threaded components. Male-to-Male (M×M) connects two female-threaded components. If you're unsure, the F×M configuration covers most standard air compressor setups.

Brass ball valves are generally compatible with water, light oils, and many non-corrosive fluids in addition to compressed air. They are commonly used in water supply shutoff lines, pneumatic systems, and light-duty fuel lines. Verify fluid compatibility before use with chemicals, solvents, or aggressive media.