Waterway 8 Inch Waterfall Assembly in Gray - This has been used in LA Spas Hot Tubs.
The 8 inch refers to the opening in the centre for the water to come out of.

Plumbing connection is 1 Inch socket for 1 inch inner diameter hose/pipe and includes 2 screws and 2 Screw Caps.

This does not come with gaskets - Silicone is advised to seal the front and back.

The 8" version, with a total width of 244 mm, is no longer manufactured by Waterway so will be discontinued.
There is a 6" version available 675-4007

Waterway part numbers
Complete assembly 8" version: 675-4907 (discontinued)