{"product_id":"red-sea-max-e-s-reefer-downflow-valve-diaphragm","title":"Red Sea MAX E\/S\/Reefer Downflow Valve Diaphragm","description":"\u003cp\u003e\u003cstrong\u003eGenuine Red Sea spare — keep your downflow valve sealing properly.\u003c\/strong\u003e This is the replacement diaphragm for the downflow valve fitted to Red Sea MAX E, MAX S and REEFER systems — genuine Red Sea part R40370-V4.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Red Sea replacement\u003c\/strong\u003e — the small rubber diaphragm that seals and regulates the downflow valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRestores proper valve regulation\u003c\/strong\u003e — a stiffened or split diaphragm is a common cause of a downflow valve that won't hold a stable level or runs noisy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple DIY swap\u003c\/strong\u003e — no need to replace the entire valve body.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWill it fit my tank?\u003c\/h3\u003e\u003cp\u003eRed Sea part R40370-V4 is used in the downflow valve across the MAX E-series, MAX S-series and REEFER ranges. Red Sea's specific parts diagrams (by exact model and generation) weren't accessible from the manufacturer's site at the time this page was written — if you're not certain of your exact model and generation, send it to us before ordering and we'll confirm against Red Sea's parts records.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e the downflow valve assembly on Red Sea MAX and REEFER systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e other brands' overflow valves — it's a direct-fit Red Sea part, not a generic diaphragm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitting notes\u003c\/h3\u003e\u003cp\u003eThe downflow valve assembly is removed from the valve body to access the diaphragm — Red Sea's cleaning and adjustment guide for the downflow valve covers the same disassembly steps. Rubber parts age even when they still look intact, so replacing the diaphragm during routine maintenance is worth doing ahead of a failure rather than after a noisy overflow shows up.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by the manufacturer's standard warranty against defects, in addition to your rights under Australian Consumer Law. Standard shipping across Australia.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow do I know if my diaphragm needs replacing?\u003c\/h4\u003e\u003cp\u003eA downflow valve that won't hold a stable water level, needs constant micro-adjustment, or has become noisy are the usual signs — though a stuck or dirty valve body can cause the same symptoms, so it's worth cleaning the valve first.\u003c\/p\u003e\u003ch4\u003eDo I need to remove the whole valve to fit this?\u003c\/h4\u003e\u003cp\u003eYes — the valve assembly comes out of the body to access the diaphragm, the same disassembly Red Sea describes for cleaning and adjusting the valve.\u003c\/p\u003e\u003ch4\u003eNot sure if this fits my system — what should I do?\u003c\/h4\u003e\u003cp\u003eSend us your exact model and generation before ordering and we'll confirm fitment against Red Sea's parts records.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774151282979,"sku":"MAX72e","price":27.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/MAX72e_1.png?v=1772078552","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-max-e-s-reefer-downflow-valve-diaphragm","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}