If you're diving into some serious custom work, this HPS 3-1/2" (89mm) High Temp Silicone Straight Coupler Hose is a solid choice. At 6 inches long, it’s built tough with a 4-ply reinforced design that really stands up to the heat. We’re talking about a temperature range that can handle anything from -65°F to a scorching +350°F (that’s about 177°C for the metric folks). Perfect for those high-pressure connections that need to keep their cool under intense conditions.
This silicone coupler hose isn’t just for show; it meets and exceeds the SAE J20 industry standards, so you know it’s built for heavy-duty applications. Whether you’re working on a marine setup, crafting custom turbo or intercooler piping, or even tackling a DIY intake or radiator cooling system, this hose has got your back. Just keep in mind, it’s not compatible with fuel or oil, so steer clear of those applications.
One of the best parts? It’s UV and ozone resistant, which is a big deal if you’re out in the elements. You won’t have to worry about it breaking down on you after a season of exposure. The blue color adds a nice touch too, making it a standout piece in your setup.
Here’s a quick rundown of the specs: the inside diameter is 3.5 inches (89mm), while the outside diameter comes in at 3.9 inches (99mm). The wall thickness is around 4.5mm, give or take a bit. It’s a solid piece of kit that’s ready to work as hard as you do.
In short, if you’re looking for a reliable, high-performance silicone coupler hose that can take the heat and handle tough jobs, this HPS option is definitely worth considering.
⚠ 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.