SPD-T4DT is a TA4f to D-Tap (P-Tap) cable. The SPD-T4DT is meant to be used with TA4f-compatible powered devices that are within the voltage range of a P-Tap(D-Tap) battery.
This TA4f-compatible cable is capable of working with batteries like the following;
I found these cables on the Deity website in my last effort to find a solution while rigging my sound cart. Not only were the cables available, the price was amazing and they were shipped and I received them extremely fast. Will definitely be a first option from now on!