Hi Peggy and all,My less than 1 year old Groco HF manual head stopped drawing water up through the thru-hull. I can't understand what the problem is. I was on the boat, the head worked fine. After returning from a two week vacation, I'm getting no suction when I pump the handle up and down. I made sure the thru-hull was open. I even went underneath the boat and scrubbed any critters from the bottom of the boat, thinking maybe some marine growth was interfering. I "primed" the head, also with no better results.One thing I've noticed, and this is weird because no one has been on the boat since I left it, the lever next to the hand-pump labeled "flush dry" can now rotate completely around. I know this is something new. Before, the lever's range of motion was only about 45 degree, if that even.Thanks Peggy.