Found 3 3D-models for “Return Valve” across many websites

#airtight#fire#exhaust#air valve#backdraft#Vectra S2#backflow preventer#fitting#Gas#air ventilation
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Fire back-pressure valve aka Bubbler

Fire back-pressure valve aka Bubbler

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Ecotech Verctra S2 Return Valve Adapter

Ecotech Verctra S2 Return Valve Adapter

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Non-return valve for DIY exhaust ventilation - Обратный клапан для вытяжной вентиляции

Non-return valve for DIY exhaust ventilation - Обратный клапан для вытяжной вентиляции

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