If the garden hose blows out near the middle, you might want to get two couplings* rather than one union so you can make two 25 footers, which are damn handy when (if) you get old (older). If you need 50’, why, they do screw together, Missy. Note: Yuppies should just throw the thing out and buy a new one, Gorewellian carbon footprint be damned. This is repair, Reba, not “reparations”; it’ll only confuse ya.
*When choosing couplings, be sure to select one whose chosen (and proven) pronoun is “him”, one “her”. In the mechanical world, only males and females screw together. This annoys the crap outta the LGBT-WHATEVERS. Cool.