Right now when we assemble the modules, a few of the branches are free to turn. The fish-mouth molded end that goes into the receptor pipe is supposed to keep the branch from spinning appears to be inadequate for some branches, and even where it does offer significance resistance, I'm not sure it'll be sufficient to resist 100 backwashes without turning one way or another to some degree. One solution is to drill a hole parallel with the trunk in all of the branches and fish a 1/4" AL rod through running parallel to the trunk at the receptor end. Here is a pic of where the potential rod would go (in grey):
We can bend the ends to keep it from coming out during installation, and unbend if we ever need to take the modules apart. If that is too permanent (cause the metal breaks after multiple removals), than we can instead bend one side and use a bolt and nut to secure the other.
Right now when we assemble the modules, a few of the branches are free to turn. The fish-mouth molded end that goes into the receptor pipe is supposed to keep the branch from spinning appears to be inadequate for some branches, and even where it does offer significance resistance, I'm not sure it'll be sufficient to resist 100 backwashes without turning one way or another to some degree. One solution is to drill a hole parallel with the trunk in all of the branches and fish a 1/4" AL rod through running parallel to the trunk at the receptor end. Here is a pic of where the potential rod would go (in grey):
We can bend the ends to keep it from coming out during installation, and unbend if we ever need to take the modules apart. If that is too permanent (cause the metal breaks after multiple removals), than we can instead bend one side and use a bolt and nut to secure the other.