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Welcome To Swimming Pool Valve Parts
COMPOOL VALVE PARTS
ORTEGA Valve Replacement Parts
Jandy Valve Replacement Parts
Handle Only
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Pentair Valve Replacement Parts
271151 Pentair Top/Side Mount 2.0 in. Backwash Valve, Top O-Ring .
$20.95
272412 Pentair 2.0 High Flow
Backwash Valve, Top
Part No.
271151
$53.95
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Jandy valves are designed so that you can glue a pipe to the inside of the valve port or a fitting to the outside of the port.  
The 1.5 x 2.0" valve takes a 1.5" pipe on the inside of the port or a 2.0" fitting on the outside of the port
This design makes the valve body re-usable if you have to cut it out and replumb it.  The Jandy, Compool, and Hayward valves all operate in a similar fashion.