Alright, let’s talk about the HPS 3" to 3-1/2" Reducer Coupler Hose. If you're diving into some serious DIY projects or just need a solid piece for your turbo setup, this is the hose you want. It’s 6 inches long and made from high-temp, 4-ply reinforced silicone, so you know it’s built to last under pressure.
First off, this hose meets the SAEJ20 standards, which means it’s not just some cheap knockoff. It’s tough enough for heavy-duty pressure connections and handles high temperatures like a champ, with a range from -65°F to +350°F (that’s about -54°C to 177°C for those keeping score in Celsius). So whether you’re working on your radiator, custom intercooler piping, or even a marine application, this hose has got you covered.
Now, let’s get into the nitty-gritty. The inside diameter ranges from 3 inches to 3.5 inches (76mm to 89mm), which is perfect for a lot of setups. The outside diameter is between 3.39 inches and 3.60 inches (86mm to 99mm), and it has a wall thickness of around 4.5mm. Just keep in mind, while it’s super durable, it’s not compatible with fuel or oil—so don’t try to use it in those applications.
Another cool feature? It’s UV and ozone resistant, so it won’t break down or get funky when exposed to the elements. If you’re like me and appreciate gear that can take a beating, this hose fits the bill.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

HPS Performance Products is a leading manufacturer of aftermarket performance parts, fabrication components, and silicone hoses. HPS serves a number of different industries, including automotive, aerospace, construction, commercial truck/bus, marine, agricultural, turbo diesel, off-road, performance racing, general manufacturing, and water treatment. The company’s ability to fabricate custom-shaped multiply silicone hoses make it ideal for a wide range of applications. The multiply carcass makes HPS’ hose perfect for coolant and turbocharged pressure applications while the fluoro-silicone-lined hoses make it safe to be used with petroleum-based oil and fuel.
HPS Performance Products is committed to meeting its original goals of producing quality parts at competitive pricing and providing customer service responses in a personal, timely manner. All HPS products have been thoroughly tested on the dyno and track, and meet or exceed SAEJ20 standards. The HPS staff has solid expertise in the silicone hose department, which allows them to deliver standard size silicone hoses with same-day shipping. HPS’ highly skilled and knowledgeable team, paired with the latest state-of-the-art technology, ensures the brand’s continued success and reputation as a premier manufacturer in the industry
HPS Quality Silicone HosesHPS Performance Products specializes in and is best known for manufacturing multi-application silicone hoses. HPS silicone hoses are carefully crafted from only the highest quality 4-ply reinforced high-temperature material. The hoses are available in the following varieties: straight coupler, 1-foot tube, 3-foot coolant tube, charge air cooler hose (CAC), hump coupler, reducer couple her, 45-degree elbow coupler and reducer, and 90-degree elbow coupler and reducer.
HPS Performance Products also carries performance silicone vacuum hoses and silicone heater hoses. You can choose silicone hoses in both standard inch and hard-to-find metric sizes. Stainless steel T-bolt clamps are available to match with the silicone hoses as well. In order to meet the high demand and shorten the turnaround time for its silicone hoses, up to 90 percent of the product is already in stock and ready to ship or pick up from HPS authorized dealers like Vivid Racing.
HPS Performance Products at Vivid RacingVivid Racing carries a comprehensive lineup of HPS Performance Products for a number of different makes, models, and applications. Our extensive inventory of HPS parts includes aluminum tubing, cold air and short ram intakes, vacuum lines, hoses and clamps, intercooler pipes, radiator caps, and much more! If you have any questions regarding the items listed above or have fitment concerns, please contact our expert sales team at (480) 966-3040. We are here to help you through the entire purchase process and make it a pleasant experience.