Yes. The first few times you mate your main power connector to your motor or battery, they will be very tough to mate. You have to make sure the tabs are aligned, push the connector in all the way and turn 180° until you feel the connector click into place. Failing to mate the connector fully will result in water intake and possible damage to your motor or battery.
Your connectors will become much easier to connect after the first few times as the o-rings take their place.
NEVER force the connectors to mate with tools. You will run the risk of breaking off the two small tabs on your connector and rendering your device useless.
NEVER over tighten your connectors. Your connectors turn about 180° into their locked position. Once they're locked, they are locked. There is no tightening required. If you over-tighten your connectors, you run the chance of ruining the internal threads and destroying your device. This sort of damage is not covered by the warranty.
Click here to an illustration on how to mate your connectors. All of your connectors are the same, whether you have a Swim Jet or an Outboard jet for your kayak or SUP.