Lub thawv 'meter' mounted rau ntawm phab ntsa rau cov ntsuas dej feem ntau hu ua "dej ntsuas dej," txawm hais tias qee qhov chaw nws tseem hu ua "water meter box," "dej meter casing," lossis "dej ntsuas vaj tsev." Cov ntsiab lus sib txawv me ntsis nyob ntawm thaj av, tab sis lawv txhua tus ua haujlwm rau lub hom phiaj ntawm kev tiv thaiv thiab kev ruaj ntseg ntsuas dej.
Ib qho dej ntsuas dej feem ntau muaj ob ntu: lub thawv thiab lub phaj npog. Lub thawv feem ntau yog ua los ntawm corrosion-resistant thiab acid-alkali resistant cov ntaub ntawv xws li steel phaj los yog fiberglass, muab zoo sealing thiab waterproofing. Lub npog phaj feem ntau yog ua los ntawm hlau lossis stainless hlau, muab kev tiv thaiv corrosion siab thiab thauj khoom -cov kabmob muaj peev xwm. Tsis tas li ntawd, cov qhov cua tshuab feem ntau tau muab tso rau hauv lub hau npog kom muaj qhov cua txaus rau lub ntsuas dej thaum lub sijhawm ua haujlwm.
