B-Line 4A-09-06-HT12 Eaton series imperial cable tray and ladder - Length 19.5 in, Width 9 in, Height 4 in - Aluminum

It joins 9 inch and 6 inch cable tray widths. That is the point of a reducing tee: the run comes in at one width and the branch (or continuation) leaves at the narrower one, so you don't need a separate reducer plus a straight tee.

Aluminum. That is the usual choice where weight and corrosion resistance matter more than raw strength, including outdoor runs and wet or chemically aggressive areas. It also means the fitting needs to be bonded like any other tray section, and you should keep the fasteners and adjoining tray in matching material to avoid galvanic problems.

Yes, it carries a UL Classified marking. For inspectors treating cable tray as an equipment grounding conductor or checking the assembly against NEC Article 392, that classification is what they look for on the fitting as well as the straight sections.

Plan on 19.5 inches of length, 9 inches across, and 4 inches of height for the fitting itself. The 4 inch dimension corresponds to the tray loading depth, so it matches 4 inch deep tray on both legs. Check the 19.5 inch figure against your support spacing, since a fitting this size normally needs a hanger close to each connection point.

Use the reducing tee when the width change happens right at the branch point. The 4A-09-06-HT12 handles the 9 inch to 6 inch transition and the three-way split in one piece, which means fewer splice joints, fewer bonding points and a shorter overall fitting than stacking a reducer against a full-width tee. If the reduction happens somewhere along a straight run instead, a separate reducer is the right part.

Order Eaton B-Line part 4A-09-06-HT12. Reading the number: 4 inch depth, aluminum, 9 inch main and 6 inch reducing leg, horizontal tee on a 12 inch radius. Splice plates and hardware are ordered separately on B-Line tray fittings, so confirm you have enough connectors for all three ends.

9.647 lb. Light enough for one person to hold up while a second sets the splice plates, which is typical of aluminum tray fittings and part of why crews pick aluminum over steel for long overhead runs.