TWS Valve o se taʻutaʻua faʻatau atu o valve maualuga, ofoina atu le tele o oloa e aofia ai valve butterfly resilient, valve gate, valve polo ma siaki siaki. I totonu o lenei tusiga, o le a tatou taulai atu i siaki siaki, faʻapitoa paʻu nofo paʻu siaki valve ma lua ipu siaki siaki. Le...
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