replaces mine too
It looks as though you can get to your tank to replace it if necessary. On my OD 28 it was under the settee and was installed during the boat's construction and couldn't be removed. I ended up cutting it to pieces under the settee with a roto-zip equipped with a plastic/aluminum tool. Took about a half hour to get it out and replaced it with a bladder tank. I love the bladder because it has no air vent to the outside. Pressure on the collapsing tank as water is used allows the pump to pull water from the tank. I pull it out in the winter, give it a rinse with a MILD bleach solution and store it in the basement. Easy in, easy out.I suspect that your tank is polypropelene which cannot be easily bonded. I'm told there is a way to chemically "weld" the stuff so you may want to look into that if you want to keep the tank.As I recall the bladder for my size storage area was around $120 plus shipping. It's a rectangular 20 gallon tank and it works GREAT.Good Luck