THESE WERE USED TO TEST FIT IN BOATS.   MOST HAVE NEVER HAD WATER IN THEM, JUST AIR.   SOME ARE NEW AND STILL IN BOXES.  THERE'S NOTHING WRONG WITH THEM, THEY'RE JUST NOT IN THE ORIGINAL PACKAGING.  SOME HAVE ADDITIONAL QUICK CONNECT FITTINGS.   ALL SOLD "AS IS".  NEW IN BOX ITEMS ARE 45% OFF, USED ARE 50% OFF.   THERE IS ONLY 1 OF EACH ITEM.