Yeah - I just unscrewed those and replace them with push fit connectors - those threads on the snorkel gate the same as the push fit threads that come in extended breather kits from 4x4/off road parts dealers
Google ‘push fit connectors Land Rover’ or something, I forgot the actual thread size sorry but I got mine off eBay similar to this
Google may have that answer though as it’s the same thread size as where the breather banjo bolt screws into the actual axle casing (well it was on mine)