Hi marc here from the former GBRJET.

As this product and the Maglok's he sells are blatant copies of my products which I designed I can help you here. My D-CAT product required the nipples if they are the barbed type to be fitted using something like Aeropoxy or the Hysol 9462 epoxy, if its a Festo push fit then the O ring seal fitted to the Festo connection should suffice but pressure check before hand.

Happy to help and mighty glad to be out of this hobby where everyone just rips off each others product without any consideration.

Safe flying.

marcs