ASC Engineered Solutions 1X1/8 BLK MI HEX BUSHING

It takes a 1 inch male pipe thread down to a 1/8 inch female pipe thread. The large end (1 inch) threads into a fitting or coupling, and the 1/8 inch tapped center accepts a gauge, plug, small sensor line, or 1/8 inch pipe. That is a big step down in one fitting, so it is most often used as a gauge or instrument port rather than a flow reducer.

No. Black malleable iron is for gas, air, steam, and non-potable service. For domestic water you want galvanized, brass, or copper on the wet side, since black iron will rust in potable lines. Black fittings like this one are standard on natural gas and fire protection piping.

The fitting carries UL/FM recognition, which is what an inspector looks for on fire protection piping. It is standard pressure class malleable iron built to ASME B16.3, so it is the class of fitting used on threaded sprinkler branch work rather than an extra-heavy fitting.

Cast malleable iron to ASTM A-197, with dimensions and pressure class per ASME B16.3. That is the standard spec pairing a mechanical contractor sees called out on threaded black iron drawings, so it will satisfy a submittal asking for Class 150 malleable iron threaded fittings.

A hex bushing has wrench flats on the shoulder, so you can tighten it with a standard wrench after the 1 inch end is started. A flush or face bushing has no flats and needs an internal hex key or a bushing wrench, which is awkward in tight work. If the 1 inch port has clearance around it, the hex is the easier install. If a fitting sits tight against a wall or another fitting, the face style is the one that fits.

0.24 lbs each. Handy if you are pricing freight on a bulk MRO order, since these are commonly bought by the box for gauge and drain taps across a facility.