逆止弁 ST-401 横式逆止弁TOHO Brand Bronze Swing Check, with Metal Disc, 300WOG Download Drawing ST-402 立式逆止弁TOHO Brand Bronze Lift Check Valve, with Rubber Disc washer, 300WOG Download Drawing ST-403 ねじ込み形Y型逆止弁TOHO Brand Bronze Y pattern Swing Check, with Metal Disc, 200CWP Download Drawing ST-404 溶接型Y型逆止弁Y pattern Bronze Swing Check, with Metal Disc, 200CWP Download Drawing