Bait Pump Question

[robbor]

Im going to try and make a smaller version of the bait pump in shop class and Im wondering what size the hole is in the tip??? Thanks

[sac-a-lait]

that small 1/4" plastic tubing for a fish tank etc fits over the tip perfectly.

[robbor]

Id like to know what size the hole in the tip is where the nibble comes out. Probably have to stick the base of a small drill bit in to see the size. Im want to try using a smaller tip like a ball inflator tip so i can also use in in micro tubes or what ever and have an easy fit.