[andy2847]

anyone know how this is done basically its getting air out of system when changing over barrells and in the destructions it says it needs to be primed. i am confused??
Thanks

[ladders no more]

http://www.wally-the-window-washer.co.uk/airlock.wmv
look at wallys vid its the same thing as priming its just to get the air out
then you will be ok