If you're diving into some serious engine work or just need to upgrade your cooling system, the HPS 4-1/2" (114mm) High Temp Silicone Straight Coupler Hose is definitely worth considering. This isn't just any coupler—it's a heavy-duty piece that’s built to handle the heat. With a temperature range from -65°F to a scorching +350°F (that’s about 177°C for those who prefer metric), it’s designed to keep your performance on point, even in the toughest conditions.
What really stands out is the 4-ply reinforced silicone construction. This means it’s tough enough to handle high-pressure connections without breaking a sweat. 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 coupler has your back. Plus, it meets and exceeds the SAEJ20 industry standards, so you know it’s not just some generic part.
One of the things I appreciate about this hose is its UV and ozone resistance. If you’re running your rig in the sun or dealing with harsh environments, this feature is a game changer. Just keep in mind, this silicone hose isn’t compatible with fuel or oil, so plan your setup accordingly.
Now, let’s talk numbers for a second. The inside diameter sits at a solid 4.5 inches (114mm), while the outside diameter is about 4.89 inches (124mm). The length is a convenient 4 inches, and with a wall thickness of around 4.5mm, it’s sturdy without being overkill. The blue color? It’s not just for looks; it adds a nice pop to your engine bay.
In short, if you want a reliable, high-performance silicone coupler that can take the heat and keep your setup running smoothly, the HPS 4-1/2" coupler hose is a solid choice. It’s not just about looks; it’s about getting the job done right.
⚠ 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.