LimeLight hull 51 has a bladder, 14 gal It was installed in the early 90's. And seems to be working just fine and is good for racing. However up in Canda BC there isnt has many pump out as there is in the USA and we find 14 Gal to be a bit small when we are cruising. Thinking about putting in a tank with larger capacity 20 to 25 gal for those summer trips, plus I am not sure what the shelf life of the bladder is and wouldnt want it to fail.