{"product_id":"evil-energy-6an-to-3-8-inch-hardline-compression-adapter-black-4-pack-aluminum-body-with-brass-ferrule","title":"EVIL ENERGY 6AN to 3\/8-inch Hardline Compression Adapter Black 4-Pack — Aluminum Body with Brass Ferrule","description":"\u003cp\u003e\u003cstrong\u003eEVIL ENERGY's 6AN male to 3\/8\" hardline compression adapter is an aluminum flare-to-hardline connector that converts a 6AN male (9\/16-18 UNF) flare fitting to a 3\/8\" OD stainless or aluminum hardline using a brass ferrule seal.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact adapter lets you join AN-flared fuel or fluid lines to rigid 3\/8\" hard tubing where a compression-style connection is required. Machined from lightweight aluminum with a brass ferrule, the fitting uses a 37° flare angle on the AN side for sealing and is sold in a convenient 4-piece set. Before installation, confirm the hardline outside diameter and material — these adapters are designed specifically for 3\/8\" stainless steel or aluminum hardlines.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this adapter connect a 6AN line to a hardline?\u003c\/h3\u003e\n\u003cp\u003eThe adapter threads onto a 6AN male flare (9\/16-18 UNF) and compresses a brass ferrule around a 3\/8\" OD hardline, creating a mechanical seal. The AN side seals against the 37° flare face while the ferrule bites the tubing when the nut is tightened.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e6AN male thread size: 9\/16-18 UNF for standard AN flare fittings\u003c\/li\u003e\n  \u003cli\u003eHardline compatibility: accepts 3\/8\" outside-diameter stainless or aluminum tubing\u003c\/li\u003e\n  \u003cli\u003eSealing method: 37° flare on AN side plus compression ferrule on hardline side\u003c\/li\u003e\n  \u003cli\u003eSold quantity: four adapters per pack for multi-connection projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich materials and finishes are used, and why do they matter?\u003c\/h3\u003e\n\u003cp\u003eEach adapter body is aluminum alloy to reduce weight and resist corrosion, while the ferrule is brass to provide a durable, deformable gripping surface on metal tubing. The black finish helps resist surface wear and provides a discreet look in engine bays or custom fuel systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBody: lightweight aluminum alloy for strength and low weight\u003c\/li\u003e\n  \u003cli\u003eFerrule: brass ferrule provides reliable compression on hardline\u003c\/li\u003e\n  \u003cli\u003eFinish: black coating for added wear resistance and aesthetics\u003c\/li\u003e\n  \u003cli\u003eUse-case durability: designed for automotive fuel delivery and general fluid systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before buying and installing these adapters?\u003c\/h3\u003e\n\u003cp\u003eMeasure the hardline outside diameter and verify the tubing material — these compression fittings are intended only for stainless steel or aluminum hardline, not for soft tubing like rubber. Also confirm you need a 6AN (9\/16-18 UNF) flare interface; incorrect thread or tubing size will compromise the seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm hardline OD is 3\/8\" (measure with calipers if unsure)\u003c\/li\u003e\n  \u003cli\u003eVerify tubing material: stainless steel or aluminum only\u003c\/li\u003e\n  \u003cli\u003eCheck mating AN fitting: 6AN male (9\/16-18 UNF) flare required\u003c\/li\u003e\n  \u003cli\u003eInspect ferrule seating and torque per system guidelines during install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? This 4-piece EVIL ENERGY adapter pack suits mechanics, fabricators, and DIY tuners who need to transition from AN-flare plumbing to rigid 3\/8\" hardline in fuel delivery, oil return, or custom fluid systems. It’s ideal for projects requiring a lightweight, corrosion-resistant connection where a compact compression-style fitting is preferred. If you work on performance engines, classic restorations, or custom plumbing runs and already use AN fittings, these adapters provide a straightforward, serviceable bridge to hard tubing — just confirm sizes and materials before installation.\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: Will these adapters work with soft rubber fuel lines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. These are compression fittings designed for 3\/8\" stainless or aluminum hardline only, not flexible rubber hose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What thread size fits the AN side of the adapter?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The AN side uses a 6AN male thread, which is 9\/16-18 UNF, and seals on a 37° flare.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"EVIL ENERGY","offers":[{"title":"Default Title","offer_id":48084606681246,"sku":"B0FQJCHQKR","price":36.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/evil-energy-front-view-adapter-pack.jpg?v=1785860721","url":"https:\/\/northtrailauto.ca\/products\/evil-energy-6an-to-3-8-inch-hardline-compression-adapter-black-4-pack-aluminum-body-with-brass-ferrule","provider":"North Trail Auto","version":"1.0","type":"link"}