CRYSTAL KAYAK: The serial number is located on the back of the kayak. The serial number starts with "CKA". Do not include that in your registration -- numbers only.
CRYSTAL BOARD: Your serial number is your purchase order number. This four-digit number can be found in your purchase email and on your invoice.
*Please be aware that warranty claims without a registered warranty certificate will not be valid. If you wish to maintain the 2-year manufacturer's warranty on the hull of your Crystal Kayak, you must register your warranty within 1 month of receipt of purchase. The manufacturer's warranty is on the Hull of the Crystal Kayak ONLY and does not cover any of the components of the Kayak Purchase.