| Specification | Details |
|---|---|
| Brand | United Brass Mfg. Inc. |
| Part / MPN | US4IF |
| Manufacturer Equivalent | US4-108N |
| Product Type | Reducing Flare Swivel Nut |
| Flare Size 1 | 5/8 in |
| Flare Size 2 | 1/2 in |
| Size | 5/8" × 1/2" |
| Material | Brass |
| Manufacturing Process | Forged |
| Connection Type | SAE Flare / Swivel |
| Configuration | Straight Reducing Swivel |
| Typical Service | LP Gas / Propane / Copper Tubing Systems |
| Unit of Measure | Each |
's current product index identifies US4IF as a 5/8" × 1/2" reducing swivel nut, and its propane catalog lists it with a standard pack quantity of 10.
The manufacturer/distributor cross-reference is especially strong here: American Copper & Brass currently lists United Brass US4-108N as a 5/8" × 1/2" OD forged flare swivel nut.
For sale is a United Brass US4IF / US4-108N forged brass reducing flare swivel nut, sized 5/8" × 1/2".
This fitting is designed to provide a swivel-type connection between compatible flare components of different sizes. Its forged brass construction provides strength, durability and corrosion resistance for properly specified fuel-gas and industrial tubing installations.
The reducing design allows a 5/8" flare-size connection to transition to a 1/2" flare-size connection, making it useful when joining differently sized flare components without using a larger multi-piece adapter arrangement.
Marshall Excelsior independently catalogs the same industry configuration as ME-US4-10-8, identifying it as a forged reducing swivel nut for 5/8" × 1/2" O.D. tube sizes.
Typical applications include propane/LP-gas piping, copper tubing installations, appliance supply lines, regulator connections, tank equipment and other compatible SAE flare systems requiring a 5/8" to 1/2" reducing swivel connection.
For fuel-gas installations, verify tubing size, fitting compatibility, working pressure and applicable installation codes before use.