eddie
LIFE MEMBER
Doesn't mean that its good idea, even in 2016!I have a Chausson 630 have just bought a mounting base and securing strap and fixed a 6kg bottle with the seal in for a spare. Drop vent isn’t required there are no regulations for private vehicles only commercial vehicles and I have seen them ie commercial vehicles plumbers no vents.
Boats don't have drop vents
Boats often explode LOL
For the sake of a small hole drilled in the floor and tuppence worth of plastic vent why take the risk