Modular valve fa'aaoga e fa'atapula'a ai le mamafa o se ta'avale eletise i se tau fa'avasegaina.
A oʻo i lenei tau, e tatala le valve ma faʻamalolo le mamafa ina ia aua neʻi alu aʻe i luga aʻe o le tau faʻatulagaina.