NO "goop" (sealant") on hose connections, so do what's necessary to remove what's there. Warming the ends a bit--JUST a BIT!--and a little dishwashing liquid (NO oil
or grease!!) makes them easier to slip onto the fittings (also makes them a lot easier to remove when the time comes to replace). Double clamp each connection, putting the screws 180 degrees apart...or at least 90 degrees if location makes 180 impossible.
I can't tell what the hose in your photo
is used for, but if a tank vent line, it should be replaced with sanitation hose. If it's a fresh water
hose, it should have a red stripe if it carries hot water
, a blue stripe for cold.
You might want to spend a little time on hose mfr's sites to learn all the different types of hoses that should be used for specific jobs. The Trident Rubber site is a good place to start Trident Marine Systems--Hoses