13/16" tube ( sold by the foot ) is used in some IN and OUT tanks, and all Autotrol 155 & 255 before 1998.
Was also used in some Fleck and Erie Valves.
Now most Valves use the 1.05" size tube, which is equal to the outer diameter of 3/4" PVC pipe.

NOTE: We will only ship pipe in 36 inch lengths or shorter.
If you need a long piece, we will ship it in sections, and include pieces of PVC to couple the pieces together.
We recommend you order and use the larger 1.05" O.D. distributor when possible, which will allow you to use 3/4" PVC pipe for your tube.