The adapter ends on my pool hose had degraded and were flaking apart. They also didn't fit my vacuum very well, so I designed a replacement. I printed this in PLA, which is probably not an ideal 'in the pool' material, but we don't have any other great filaments for use in chlorinated water and sunlight (even the stuff you buy tends to degrade over time) so I just figured PLA, then make a new one when it fails. Should be a good experiment anyways.