This kit is a Waterway Viper 3.0HP Impeller, Seal, (1) Bearing, Install Tool and Silicone.. 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: 

Waterway Viper Shaft Seal Kit, Silicon & Tool Buna

Waterway Viper Shaft Seal Kit, (1) Bearing, Silicon & Install Tool

Waterway Viper Shaft Seal Kit, (2) Bearing, Silicon & Install Tool

Viper, Face O-Ring, Waterway, Pump 2 1/2" x 2 1/2" Wet End

Viper, Wear Ring, Impeller , Waterway, Pump 2 1/2" x 2 1/2" Wet End

Viper, Volute, Waterway, Pump 2 1/2" x 2 1/2" Wet End

Viper, Face Plate, Waterway, Pump 2 1/2" x 2 1/2" Wet End

Screw, WaterWay, Executive, E-Series,Hi-Flo,Viper,Workman,EX2, 8-32 x 5/8"

Bleeder Drain Plug & O-Ring , 3/8", Waterway Fits Executive, Viper, Hi- Flo, Iron Might, Spa Flo, Supreme, Mustang, Workman and More

O-Ring for Hot Tub Spa 2 1/2" Pump Union for Viper Xp3 Some Executive

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