The part ID 640-3257V refers to the Waterway Hi-Flo Suction Assembly, a widely used 1.5-inch slip wall fitting with a 3-3/4-inch gray cover. This component is VGB (Virginia Graeme Baker Act) compliant and has a high wall flow rate of 128 GPM.
Waterway is a major OEM supplier in the spa industry, meaning this part is installed in hot tubs by many different manufacturers.
Here is an extensive list of spa manufacturers who are known to use this specific Waterway Hi-Flo suction assembly:
Cal Spas
Coleman Spas (used in the early 2000s, 300 and 400 series, replaces P/N 100725)
Dynasty Spas (used on various models, replaces P/N 10758)
Vita Spas
This part is a standard, generic fitting used across the industry, so it may also appear in models from other manufacturers as well.
