Found the email they (WakeMakers) sent me.
As we discussed, here are the instructions from removing fittings from the bags. If you have any questions or concerns please let me know. You really can't do any damage unless you use too much heat, so better to start with not enough and try it a few times than use too much the first time.
1. Lay the bag out on a flat hard surface (a cement garage floor works well) with the fitting of interest sticking straight up into the air.
2. Using a hair dryer (and only a hair dryer, nothing more powerful) on it’s low setting, apply heat to the area where the black flange in the bag meets the grey fitting. Leave the hair dryer in place for AT LEAST five minutes.
3. With the hair dryer still pointed at the bag, stand with your feet on either side of the fitting so the soles of your shoes are on the black flange portion of the bag. The hair dryer should be between your heels pointing at the fitting in the direction you are facing.
4. With the hair dryer still pointed at the bag, push the end of the fitting straight away from you. Try to get the end of the fitting to touch the ground while your feet hold the flange of the bag flush with the ground.
You will be “popping” the fitting out of the bag, NOT unthreading it. If it doesn’t pop out the first time that’s fine, just start over with step one above. It usually takes a couple of tries to get the process down, but once you do it one time, the rest of the fittings will come out easily.