Final answer:
The two types of brass flare nuts approved for use in RVs are compression flare nuts and inverted flare nuts.
Step-by-step explanation:
The two types of brass flare nuts approved for use in RVs are compression flare nuts and inverted flare nuts.
A compression flare nut is used in conjunction with a compression fitting to create a seal between a pipe or tubing and a flare fitting. It contains a tapered sleeve that compresses onto the flare, creating a watertight connection.
An inverted flare nut is used with an inverted flare fitting to create a seal. The nut has a beveled edge that compresses onto the inverted flare, making a secure connection.