This is a Grade 316 S/S shell + ZZ shields bearing to suit a 1/4" shaft........[smaller sizes are available]
Bearings would be available from any bearing distributor, alternatively available complete in the miniature Plummer Block from SPD/SI in America [or SPD/SI distributors World wide]
ZZ stainless shaft bearings are not listed as waterproof, however delete the ZZ designation & substitute 2RS for a synthetic seal which is listed as hose down proof [for the food industry]
I understand our applications [shaft above water level, but splashed on], generally would not see a lot of water in their life time, however as shiny & cheap carbon steel bearings maybe, I would be hesitant in using them in conjunction with water
Keep us posted on a 3 shaft Paddler?
Derek