Lub kaum sab xis feem ntau ua si plaub lub luag haujlwm:
① Lub qhov hluav taws xob sab hauv thiab sab nraud ntawm kev hloov pauv;
② Dej siab loj dhau lawm, tuaj yeem hloov kho saum toj ntawm daim duab peb sab valve, kaw me ntsis;
③ Hloov lub luag haujlwm, yog tias cov kais dej ntws tawm thiab lwm yam, tuaj yeem tua cov duab peb sab valve, tsis tas yuav kaw tag nrho lub valve hauv tsev;
④ Elegant. Yog li ntawd, kev kho kom zoo nkauj hauv tsev tshiab yog qhov tseem ceeb ntawm cov kav dej fittings, yog li cov neeg tsim qauv tseem yuav hais txog kev kho tsev tshiab.