Yes HD or Lowes I always prefer Lowes they are usually less expensive not by much and I always get the military discount with no questions asked.
For the Bashwash value I always prefer the Variflow
Amazon.com: Hayward SP0710XR50 Pro-Series Vari-Flo Backwash Valve Coupling: Patio, Lawn Garden
I am in the process in replacing everything Pump, DE, Jandy, Electrical Box w/dual timers and putting GFI in the box if I need power for tools. All the pipes, Jandy, 2", 1 1/2" , all couplings,check values, bushings, etc purchase at Lowes. If you do not have one around you then online is free shipping when you spend $45.00.
Here is the Jandy at Amazon
Amazon.com : Jandy 4717 3-Port 2 to 2-1/2-Inch Positive Seal NeverLube Valve : Swimming Pool Pump Parts : Patio, Lawn Garden