Waterway 4.0 HP Viper Spa Pump Wet End [2 1 2" MBT X 2 1 2" MBT] [56 Frame] (310 0140) bluwater Choosing the correct Arctic compatible curved Choosing the correct Arctic compatible curved low flow format helps make the repair more accurate and easier to complete with confidence replacing the barrel is often the cleanest path back to the intended hydrotherapy feel without taking apart more of the assembly than necessary Complete wet end replacements are especially practical when the wet side has broader wear and the motor remains serviceable 0 HP Viper wet end needs a more complete renewal with matching 2 1 2 inch plumbing connections