{"product_id":"prokomon-exhaust-pipe-expander-set-3-piece-1-1-8-3-1-2-tailpipe-repair-kit-o-rings-case","title":"Prokomon Exhaust Pipe Expander Set — 3-Piece 1-1\/8\"–3-1\/2\" Tailpipe Repair Kit, O-Rings \u0026 Case","description":"\u003cp\u003e\u003cstrong\u003eProkomon Exhaust Pipe Expander Tool Set is a three-piece mechanical kit designed to restore and widen thin-wall muffler and tailpipe openings from 1-1\/8\" to 3-1\/2\" quickly and reliably.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact repair kit gives DIYers and professional mechanics a straightforward way to fix clamp dents, stretch pipe ends, and straighten deformed exhaust openings without replacing entire sections. The set includes three tapered expanders that work across a wide diameter range, extra O-rings for sealing and grip, and a blow-molded case for organized transport and storage.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the expander set repair dented or pinched tailpipes?\u003c\/h3\u003e\n\u003cp\u003eThe tapered mandrels are inserted into the damaged pipe opening and turned to gradually open the metal back to its original shape. Rotation is applied with a hand ratchet or wrench, letting you control expansion in small increments to avoid over-stressing the metal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThree tapered sizes cover 1-1\/8\"–3-1\/2\" inner diameters for thin-wall pipes.\u003c\/li\u003e\n  \u003cli\u003eUse a ratchet or wrench — no power tools required for most jobs.\u003c\/li\u003e\n  \u003cli\u003eExtra O-rings help center the mandrel and protect pipe edges during expansion.\u003c\/li\u003e\n  \u003cli\u003eTurn slowly and check fit frequently to prevent damage to harder materials.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich pipe materials and thicknesses can I use this on?\u003c\/h3\u003e\n\u003cp\u003eProkomon recommends this expander set for thin-wall aluminum or iron mufflers and tailpipes up to about 1 mm wall thickness. It is not intended for thick-walled stainless steel or untreated heavy-gauge tubes without preheating.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBest for aluminum or iron pipes ≤1 mm thickness.\u003c\/li\u003e\n  \u003cli\u003eNot suited for thick stainless steel; heat treatment required for harder metals.\u003c\/li\u003e\n  \u003cli\u003eWorks well on common muffler, tailpipe, and clamp-affected areas found on cars and light trucks.\u003c\/li\u003e\n  \u003cli\u003eInspect pipe condition first — severely corroded metal may need replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat sizes are included and how do I select the right expander?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains small, medium, and large tapered expanders that together cover a practical repair range. Choose the expander whose minimum diameter fits inside the damaged section, then rotate the tool outward until the diameter matches the mating pipe or clamp seat.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSmall: expands from 1-1\/8\" to 1-3\/4\" ID.\u003c\/li\u003e\n  \u003cli\u003eMedium: expands from 1-1\/2\" to 2-1\/2\" ID.\u003c\/li\u003e\n  \u003cli\u003eLarge: expands from 2-1\/8\" to 3-1\/2\" ID.\u003c\/li\u003e\n  \u003cli\u003eSix extra O-rings and a blow-mold case included for maintenance and storage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use the tools safely to avoid damaging pipes or the expander?\u003c\/h3\u003e\n\u003cp\u003eOperate the mandrel with controlled, incremental turns and avoid forcing the tool when the metal resists. For stiffer or thicker materials, apply heat to the pipe per metalworking best practices or consult a pro — excessive torque can harm the tool or pipe.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTurn slowly and check the fit frequently.\u003c\/li\u003e\n  \u003cli\u003eUse a ratchet or wrench rated for hand use; avoid cheater bars for leverage.\u003c\/li\u003e\n  \u003cli\u003ePreheat copper or thick stainless steel before expanding, if required.\u003c\/li\u003e\n  \u003cli\u003eKeep the O-rings intact to protect pipe edges and grip the mandrel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Prokomon Exhaust Pipe Expander Tool Set is tailored to home mechanics, muffler shop technicians, and anyone maintaining or repairing vehicle exhaust systems who needs a portable, cost-effective way to restore pipe openings. It's particularly useful for work on thin-wall aluminum or iron mufflers and tailpipes where replacing parts would be time-consuming or unnecessary; drivers dealing with severe corrosion or heavy-gauge stainless systems should consider professional metalwork instead.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use the expanders on stainless steel pipes?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Not on thick stainless steel. For stainless over 1 mm, heat treatment or a specialist process is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need power tools to operate the expanders?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The mandrels are designed for hand ratchets or wrenches; no power tools are necessary for typical thin-wall pipes.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Prokomon","offers":[{"title":"Default Title","offer_id":48083074711710,"sku":"B0FDPYR274","price":61.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/prokomon-front-view-expander-set.jpg?v=1785823652","url":"https:\/\/northtrailauto.ca\/products\/prokomon-exhaust-pipe-expander-set-3-piece-1-1-8-3-1-2-tailpipe-repair-kit-o-rings-case","provider":"North Trail Auto","version":"1.0","type":"link"}