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I am replacing my old water outlet/thermostat housing with a chrome version that has an "o-ring" seal. I am not familiar with this type of seal. Is this all I need or do I need to put the usual gasket and permatex sealer on the housing?
If I use just the o-ring, is gasket sealer required also?
And I have a new regular gasket with adhesive on one side. If I use this gasket, do I put permatex sealer on both sides, or just the un-adhesive side?
With O-rings, just use the O-ring, no additional sealer is needed. I'm assuming there's a groove for the O-ring to fit in. You can use a small amount of petroleum jelly in the groove to help keep the O-ring in place while you install the housing.