No alteration to plumbing screws onto your existing unions. This cable kit fits all Zodiac LM2 & D Series cells. LM2-15 LM2-20 LM2-24 LM2-30 LM2-40 / D10 D15 D20 D25. It is very important the cell leads are in good condition.
Ensure crimping is done with a good crimping tool (do not use pliers). Place smaller heat shrink over metal crimps. Place large heat shrink over all the terminals. Ensure heat is applied evenly and no terminals are exposed after heating. If brass plugs are loose fitting then open/close them slightly.
You must have a tight fit.