1.05 inch O.D. Bottom Distributor .010" - .013" slots
Used to make Distributor Tube with a piece of 3/4" PVC Pipe ( gluing the distributor to the PVC pipe with PVC Cement ).
We recommend that 3/4" schedule 40 PVC ( not CPVC ) piping be used to maximum strength ( and it is the most readly available type ).
CPVC pipe has a smaller O.D., and therefore will not work to construct a new "RISER" pipe.
This 1.05" O.D. pipe size is used on all new residential valves.
Some older valves used the 13/16" O.D. tubes,
but you can still use the larger 1.05" distributor and adapt to your old valve by gluing ( use PVC Cement ) a 6" section of your old 13/16" tube into the center of a piece of 3/4" PVC pipe that is Schedule 40.
You don't use a "coupler", but the actual pipe, 3/4" Schedule 40 PVC used with the MD1236,
since the INNER diameter matches the OUTER diameter of the 13/16" pipe it will fit tightly inside the new 3/4" PVC ( must be Schedule 40 ).
We also sell the 13/16" distributors and 13/16" pipe..Your old distributor pipe can usually be a guide to the length or height your new pipe will need to be
( And it must be Touching the Bottom of the Tank ).If the Valve is a Fleck 5600, or an Autotrol Performa 263, or 268, then you will need the new tube to be equal to the top of the resin tank ( not more than 1/4" above ).
If you are using an Autotrol 155 or 255 valve, then the height should be 1/2 - 3/4" above the top of the tank.
It is helpful to "round" or "smooth" the top edges of the new PVC pipe with sand paper so that insertion into the valve does not damage the distributor o-ring in the valve body.
* How to "Cement" or "glue" to PVC 
