This is the part that adapts the air pump to the valve on the boat while compressing the pin to allow for air to flow in/out. Print this at 100% infill as it will need to be a solid part. I printed in ABS and has held up well, you could try different materials but it will need to be strong to withstand the force of pressing in/pulling out. I increased strength over the one that originally came with the air pump as the cross bar that compresses the pin broke. Could possibly fit other items such as inflatable kayaks, paddle boards, air mattress’s etc etc.