This part is a Basket for a Filter housing mounted in a hot tub shell, It is made by Rainbow/Pentair and is Gray in color..
There are tabs on each side at the top that hold a
Spa or Small Pool Floating Dispenser (1" tabs) Floating Feeder Complete Complete Floating Feeder Tablet Size 1 inch Color Blue Manufacturer Rainbow/Pentair
This part is a Floating Filter Weir Assembly made by Pentair/ Rainbow and it is Gray in color..
The basket that is used with this Weir can be found here: