Ukukhetha kuncike kuhlelo lokusebenza kanye nohlobo loketshezi. Ama-couplers obuso obuphansi  anciphisa ukuchitheka, kuyilapho ama-push-to-connect couplers  avumela ukuxhumana okusheshayo. I-Ruihua Hardware inikeza zombili izinhlobo futhi ingancoma isisombululo esingcono kakhware inikeza zombili izinhlobo futhi ingancoma isisombululo esingcono kakhile kuhlanganisa: ukuhlola ama-O-rings ukuthi agugile yini, ukuhlola ukugqwala noma ukulimala, ukuqinisekisa i-torque efanele ekuxhumekeni, kanye nokushintsha izinto ezigugile ngokushesha. I-Ruihua Hardware incoma ukuthi kugcinwe izindandatho ze-O nezinsimbi eziyisipele esitokweni ukuze zilungiswe izimo eziphuthumayo.