Joining battery vent pipes ok?

[Happy1]

Adding two additional batteries to two existing ones, can I connect new battery vent tubes with a t or y piece to existing and save drilling two new holes in floor, or bad idea?

 

[Spanner]

Yes, I bought a couple of suitable fittings from an aquarium shop

 

[OS51EEE]

Yes u can use windscreen washer pipe and the t pieces it's only a tinny bit of gas when it's on charge it vents out to stop battery exploding the gas can be very corrosive so best vent it unless u have sealed battery