This kit is used to change from a Cal Spa Dually Pump setup to a single Pump set up since the dually pump has been discontinued.. You will have to modify the plumbing and note that this kit is for most applications and may not be all inclusive.. If you need more plumbing to finish this kit that can be ordered here or you can get 2" parts at your local hardware store... This kit features (3) 2" Heater Unions with gaskets, (1) 2" Slice Valve, (1) 2" Pump Union, (1) 2" Street x Slip 90 Ell, (1) 2" Street Sweep 90 Ell, (7) 2" Street x Slip 45's, (2) 2" Couplers, (1) 2" Wye, (2) 12" 2" Flex Pipe, (1) 2" to 1" Bushing and a (1) 1" to 3/8" Barb and lastly a 3/8" Pump Barb with a tube of Silicon... Watch the attached Video for how to install this kit...

When you replace a dual pump with a single you need a higher amperage pump and this will in most cases give you similar power and in some cases more power..

Below are Pumps that would be good choices to replace the Dually along with this kit...   

You will most likely need a Pump Cable for the new pump to the pack you can find those here: Male, Amp, Pump Cord, (2) Speed, 14 Gage, 4 Wire, 31" , Red, Black, White, Green

Complete Pump, Aqua-Flo, XP2e,4.0HP ,230v, 56fr, 2"x 2, 1 or 2 Speed 15A

Spa Hot Tub 56Fr Guangdong LX Pumps 2" X 2" 4.0HP 2 Speed 230V WUA Video How To

Pump, Waterway Executive, 5.0hp, 230v, 2-spd, 56fr, 2", OEM 

This kit requires some ability to measure and cut plumbing and have some imagination in how you install the kit....