Tri clover fittings fit together with a gasket between them and held together by a clamp. The adaptors just go from tri clover to threads, in order to be able to screw in the heating element, hose barb on the output of the valve, and 1/4" pipe threads for the temperature sensor. The first picture shows the adaptor for the heating element. You still need a way to "pot" your connections by using a box, etc. P.S. dont forget the ground wire.