Anvil 313822223 3 in FNPT galvanized union class 150
A 3-inch galvanized malleable iron union rated for Schedule 40 pipe and 300 psi maximum operating pressure
- Rated for 300 psi at 150 °F maximum operating pressure
- Galvanised malleable iron resists corrosion in water systems
- Class 150 union suits Schedule 40 piping installations
- Female NPT threads on both ends for direct pipe connection
Anvil 3-inch galvanized union for Schedule 40 piping
This 3-inch galvanized union connects two sections of Schedule 40 pipe using female NPT threads on both ends. The malleable iron construction with a galvanized coating provides corrosion resistance for water, air and oil lines. It is rated for a maximum operating pressure of 300 psi at 150 degrees Fahrenheit. The Class 150 fitting suits standard residential and light commercial plumbing installations.
Practical limits of NPT threads and Class 150 rating
Tapered NPT threads require sealant or tape to prevent leaks and can loosen under vibration or thermal cycling. The Class 150 pressure rating drops as temperature rises above the 150 degrees Fahrenheit reference point. Galvanized coating is not suitable for potable water systems where lead-free materials are mandated. This union cannot join pipes of different diameters or connect to flanged, welded or press-fit systems.
How it compares
Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.
- Price $186.99
- Pricier than about 90% of the 2,955 comparable items (median $17.99).
Specifications
| Product | |
|---|---|
| Brand name | ANVIL |
Questions about this item
Should I choose the 3-inch FNPT galvanized union or a different size for Schedule 40 pipe?
This union is built for 3-inch Schedule 40 pipe with female NPT threads on both ends, so select it only when your piping matches that exact nominal size and thread type.
What does the Class 150 rating mean for everyday pressure and temperature limits?
Class 150 indicates a maximum working pressure of 300 psi at 150 degrees Fahrenheit, giving a clear boundary for safe operation in typical water or air lines.
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