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Continue to ChatASCO 335515 - Orifice size 100mm, Mode B, Cast Iron Body, ASCO series 218 - Air/Oil Exchanger Installed On Valve https://www.valves-direct.com/product/asco-335515-orifice-size-100mm-mode-b-cast-iron-body-asco-series-218-air-oil-exchanger-installed-on-valve/