Speedbleeder replaces the original bleeder and stays in place.when your done bleeding them with the speed bleeder, can you put the the older bleeder back in,with the way boat trailers draw moisture in the system i would think after a while it would cause the speed bleeder to get rusty and clog up,i assume you do one wheel at a time right
They come with a little rubber cap, but I have never had a problem with them clogging.
I suppose if you had an very old system with crud in the fluid, it could be a problem, but if that was the case I would flush the system with the old bleeders first.
Never really had moisture in the system as I bleed my system every 2-3 years as part of my anal maintenance schedule. Takes 15-20 minutes easy peasy.
Bleed one wheel at a time and drop the tongue low so master cylinder is below frame height.
Good Luck