i work with a tank & backpack, i had a 1" tap to a hoselock fitting & a bit of garden hose to fill up with but takes ages i have just bought a tap kit so i know have a 1" outlet as well. i got 1" hose from an agricultural engineers as b&q etc dont have it that big,but its quite cheap off ebay an allhttp://www.tanks-direct.co.uk/taps_&_valves/tap_kit_1_-_%281%22_outlet%29this should fill my backpack in seconds, not fitted it yet but should be done over over weekend & i'll try & put some picks upi only have a few big jobs so dont use a reel & pump but i may get 1 fitted by drilling a separate hole in the tank