Lavorsi hydaulic fitting
 

I'm replacing a defective fitting for the hydraulic steering that goes through the back of the boat. It's a Lavorsi chrome plated fitting that has the conections on the outside of the boat for the steering ram hoses. I also have a brass fitting that goes on the inside of the boat that connects to the ps fluid hose. My question is what type of thread sealants/loctite do I need to put on the fittings?