I was looking at a used Redcrest tonite. Got the floorboards in (there were 3), pumped the aft compartment. OK but no valve in the fill hole, you've got to be quick to get the screw cap in. OK, so the wife does the front one. We get it full, I clap my hand over it, position the cap, turn it counterclockwise til the thread catches. Now, I've read "Zen