This is a Complete Speck Pump for some Swim Spas 4" Self Priming 21-80/33GS 4.0HP SF1.25 EE 208-230V 21.0-19.4A MAX..
This pump can be found in several Swim Spa brands.. Some Examples would be Artesian, Vita Spa and More..

We offer a few parts for this pump the list is below: 

Speck Pump 21-80/33G 4.0HP Parts

• This high volume, low head pump comes complete with our unique mechanical shaft seal that allows the pump, if mistreated, to run dry for up to one hour.
• Pump parts are made of 100% recyclable plastic. Non-corrosive, chemical/UV resistant, and can withstand temperatures of up to 175°F.
• The pump can be used for pool water with a salt concentration of up to 5000 ppm.
• Equipped with 4" quick disconnect unions for easy installation and maintenance.
• For pool users’ safety, the impeller has a dielectric shaft sleeve that provides absolute separation between pool water and electric parts.
• Heavy duty "1081" E-plus/extreme-E energy efficient motors for extra low energy consumption. This large 56 frame motor is thermally protected, has a PSC switchless design and extra large sealed ball bearings.
• Motor is easy to remove without disturbing the plumbing. Reusable o-rings throughout.
• Every pump is performance tested before leaving the Speck factory.

• Pools with vanishing edge, waterfall, fountain or water slide feature.