Description
Waterway Viper Pump 3.0 Impeller exclusively for A Waterway Viper pump which has 2 1/2" inlet and outlet which measures about 3 9/16" across the threads...I have found this 3HP pump impeller to be on a 10amp motor...
This pump uses a different seal than all other Waterway pumps click below for the parts related to this pump:
Closed face impeller made for the Viper pump by Waterway Plastics. Rated at 3.0hp, it is used in a Waterway Viper pump wetend, and must be installed on a 3.0hp (or greater) thru bolt motor. 
Impeller Type    Closed Face
Impeller Diameter OD    3-13/16"
Vane Width ID    5/8"
Eye Diameter OD    2-5/8"
Eye Length    3/4"
Impeller Width OD    7/8"
Seal Seat Depth    n/a
Shaft Length    1-1/4"
Shaft Diameter OD    5/8"
Seal Seat Diameter OD    n/a
Manufacturer    Waterway
Pump Application    Viper
 
             
             
                             
                             
                             
                             
                             
                             
                                 
             
                                 
             
                                 
             
                                 
             
                                