Pay attention to the size of these pads. 3.15 inches (8cm) and exactly the same as the ones that came with several of my inflatable surfboards (iSUPs) from different manufacturers. I wouldn't get a larger D-ring patch except for inflatable kayaks and boats. Adding these patches to an inflatable boat is not very difficult. In fact, I've done this several times since trying to figure out the best way to do it not too long ago. First of all, I was disappointed to find that there are NO instructions or videos. available online showing how to attach the D-rings to the iSUP where the styrofoam got in the way. find it makes a very secure mount. Instead, I recommend attaching D-rings to the PVC itself for a stronger connection. There is an article online with step by step instructions and pictures by searching "Yuenx Convert Isup to Kayak". Gluing PVC D rings is very easy. PS: - Put out the dry, clean, deflated kayak - Apply PVC glue to where the D-rings should be and leave for 30 seconds until it becomes tacky - If the glue becomes tacky press on the D-ring and smooth out any creases on the stain. Weigh or pinch the patch. Let it dry for 24 hours before inflating the kayak. Google "yuenx convert isup to kayak" for step-by-step instructions.
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