{"product_id":"reducer-coupler-4-00-id-x-5-00-id-x-3-00-long-blue-vibrant-2777b","title":"Reducer Coupler, 4.00\" I.D. x 5.00\" I.D. x 3.00\" long - Blue - Vibrant 2777B","description":"\u003ch1\u003eReducer Coupler, 4.00\" I.D. x 5.00\" I.D. x 3.00\" long - Blue\u003c\/h1\u003e\u003cp\u003eStepping a 4 in pipe up to a 5 in inlet with hard tubing means a welded cone, extra length and one more joint that can leak. Vibrant 2777B handles the same change in a 3.00 in long silicone sleeve, with a 4.00 in I.D. on one end and a 5.00 in I.D. on the other. Dealers list this size for spots such as turbo compressor housings, intercooler end tanks and charge pipe assemblies, and it works just as well joining a large air filter adapter to a smaller intake tube.\u003c\/p\u003e\u003ch3\u003eConstruction\u003c\/h3\u003e\u003cp\u003eThe coupler is hand wrapped from four plies of silicone with aramid reinforcing fabric between each layer. Vibrant rates its transition couplers from -75°F to 392°F and offers them in black or blue, and resellers list this size as meeting the SAE J20 hose standard. The blue color is mostly a styling choice, though it also makes oil residue and a weeping joint easier to spot during a quick under-hood check.\u003c\/p\u003e\u003ch3\u003eMeasuring before you order\u003c\/h3\u003e\u003cp\u003eCoupler sizes are inside diameters, so measure the outside of each tube or fitting it will slide over rather than the old hose. The target here is a 4.00 in O.D. pipe on one side and a 5.00 in O.D. inlet on the other. Leave enough tube inside each end for a clamp to sit fully on it, and bead-roll aluminum pipe ends if the system runs meaningful boost.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs 2777B the same part as Vibrant 2777?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, apart from color. Both are 4.00 in by 5.00 in I.D. reducers, 3.00 in long, with four-ply construction; 2777 is black and the B suffix marks the blue version.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat clamps should I use?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA reducer needs two different clamp sizes, one for the 4 in end and one for the 5 in end. T-bolt clamps give the most even squeeze on four-ply silicone and are far less likely to cut the hose than worm-drive clamps.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it be used on an oil or fuel line?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Vibrant limits its silicone transition couplers to air, water and coolant service. Oil mist and fuel soften silicone over time, so breather and fuel plumbing need a hose rated for those fluids.\u003c\/p\u003e\u003ch2\u003eFitment: Universal. Confirm the sizes and thread types listed above against your application before ordering.\u003c\/h2\u003e","brand":"Vibrant Performance","offers":[{"title":"Default Title","offer_id":45243173044507,"sku":"2777B","price":48.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0764\/5213\/5195\/files\/2777B_WEBL_9bf293cf-6205-4ac6-9cf2-83a1a13a1848.jpg?v=1686312929","url":"https:\/\/www.radiantspeedworks.com\/products\/reducer-coupler-4-00-id-x-5-00-id-x-3-00-long-blue-vibrant-2777b","provider":"Radiant Speed Works","version":"1.0","type":"link"}