If you're diving into some serious automotive projects, you’ll want to check out the HPS 1" to 1-3/8" (25mm - 35mm) 4-ply Reinforced Black Silicone Reducer Coupler Hose. This thing is built to handle the heat—literally. With a temperature range that goes from a chilly -65°F up to a scorching 350°F (that’s about 177°C for you metric folks), it’s perfect for those high-pressure connections where standard hoses just won’t cut it.
Made from high-temperature silicone, this coupler hose is reinforced with a solid 4-ply design, which means it’s tough enough for marine setups, industrial applications, or even your custom turbo or intercooler piping. If you're into DIY projects, this hose will serve you well for intake or radiator cooling systems. Just keep in mind that it doesn’t play nice with fuel or oil—so save those applications for something else.
The dimensions are spot on for a variety of setups. The inside diameter ranges from 1" to 1-3/8" (25mm to 35mm), while the outside diameter stretches from 1-3/8" to 1-3/4" (35mm to 45mm). At 3 inches long, it’s just the right size to fit snugly in your build. Plus, the wall thickness is about 4.5mm, giving it that extra durability you need when the pressure’s on.
And let’s not forget about the UV and ozone resistance—this hose isn’t just built for performance; it’s built to last. Whether you’re fabricating a custom setup or just need a reliable hose for your cooling system, the HPS Reducer Coupler is a solid choice. Just remember, it’s not compatible with fuel or oil, so keep that in mind when planning your projects.
⚠ 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.