I hav a 1988 nissan pickup and there is a hex nut like part that it has three hoses, one goes to the fire wall and one hose goes to the water pump and there isa small hose, i do not know where it goes. I nooe to replace that hex nue part which is screwed to the engine bolck, I need to know what that part is called. If you can help me Thank you very much. Thanks Ray.