{"product_id":"bsnovt-radiator-overflow-hose-for-audi-a4-a5-2017-2021-oe-8w0121081an-fit-heat-resistant","title":"BSNOVT Radiator Overflow Hose for Audi A4\/A5 2017–2021 — OE 8W0121081AN Fit, Heat-Resistant","description":"\u003cp\u003e\u003cstrong\u003eBSNOVT Radiator Overflow Hose (coolant expansion tank bypass line) replaces OE 8W0121081AN to manage excess coolant for compatible Audi A4 and A5 models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your Audi’s coolant system needs a reliable bypass hose that fits like the original, this BSNOVT replacement reproduces the function and fit of the factory part. Built from heat-resistant materials, it routes surplus coolant from the radiator to the expansion reservoir, helping preserve proper system pressure and reduce the chance of coolant loss or overheating caused by a failed or brittle line.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this hose restore coolant routing on my Audi?\u003c\/h3\u003e\n\u003cp\u003eThe BSNOVT bypass line duplicates the shape and connection points of the OEM 8W0121081AN so it installs without modification. It guides overflow coolant safely into the expansion tank during temperature spikes and returns flow as the system cools.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for OEM 8W0121081AN design and fit\u003c\/li\u003e\n  \u003cli\u003eMolded ends match factory connection points for secure seals\u003c\/li\u003e\n  \u003cli\u003eMaintains proper coolant flow between radiator and reservoir\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat vehicles and years is this part compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis hose is made to fit multiple Audi models from recent model years, covering both front- and all-wheel-drive variants where the OE part is used. Check your vehicle’s year and model to confirm exact compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAudi A4 (2017–2020)\u003c\/li\u003e\n  \u003cli\u003eAudi A4 Quattro (2017–2021)\u003c\/li\u003e\n  \u003cli\u003eAudi A4 allroad (2017–2020)\u003c\/li\u003e\n  \u003cli\u003eAudi A5 Quattro and A5 Sportback (2018–2020)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and durability features does this replacement hose offer?\u003c\/h3\u003e\n\u003cp\u003eBSNOVT manufactured this hose from high-temperature-resistant compounds formulated to withstand engine bay heat, coolant chemistry, and vibration. That construction reduces brittleness and cracking compared with older, degraded hoses.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat-resistant elastomer for long-term thermal stability\u003c\/li\u003e\n  \u003cli\u003eFlexible yet reinforced sections to resist kinking and collapse\u003c\/li\u003e\n  \u003cli\u003eChemically compatible with common engine coolants\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is installation and what’s included?\u003c\/h3\u003e\n\u003cp\u003eThe part ships as a single ready-to-install hose designed for a straightforward swap where the original OE line was fitted. No extra hardware is included, so reuse factory clamps or replace them if they show wear for a secure seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne coolant overflow\/bypass hose in the package\u003c\/li\u003e\n  \u003cli\u003ePre-formed shape for plug-and-play installation\u003c\/li\u003e\n  \u003cli\u003eUse existing clamps or install new ones for best sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and independent technicians who need a reliable, OEM-form-fit replacement for a failed or aging radiator overflow hose on supported Audi A4 and A5 vehicles. Choose this BSNOVT part when you want a durable, heat-resistant hose that reinstates correct coolant routing and fits the original connection points without modification. If your coolant reservoir is losing fluid, your hose is soft or cracked, or you’re performing scheduled cooling-system maintenance, this replacement provides an affordable, direct-fit option.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this hose replace OEM part 8W0121081AN?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This BSNOVT hose is a direct replacement for OEM part number 8W0121081AN.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it fit my 2019 Audi A4 Quattro?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It is compatible with Audi A4 Quattro model years 2017–2021, including 2019.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BSNOVT","offers":[{"title":"Default Title","offer_id":55166003741015,"sku":"B0DRVBNJ66","price":39.46,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/bsnovt-radiator-overflow-hose-front-view.jpg?v=1790360873","url":"https:\/\/britishgarage.co.uk\/products\/bsnovt-radiator-overflow-hose-for-audi-a4-a5-2017-2021-oe-8w0121081an-fit-heat-resistant","provider":"British Garage","version":"1.0","type":"link"}