How to Choose the Correct Size PVC Bendit...
You need to consider the smallest diameter PVC pipe you will be bending and also the length of pipe. So, the alpha character (A or B) in our part number represents the diameter of the PVC Bendit. The A is slightly 7/16" OD while the B is 1.06" OD. The numeric (3,6,9,10,20) represents the length of the heating surface of the PVC Bendit. The overall length will be two feet longer as there are non-heated sections at each end. The element in the B-series generates more heat than the A-series but either is adequate for most diameters of PVC pipe.
If you are bending 1/2 inch and larger diameter pipe, you should select the A-series and then select the size based on the length of pipe you will be bending. The A-series comes in 3', 6', 9', 10', and 20' lengths.
If you will be bending 1-1/4 and larger PVC pipe, you will want the B-series, which has an outside diameter of 1.06".
Select the size based on the lengths of pipe you'll be bending. You can use a longer Bendit in a shorter pipe, but not vice versa...