{"product_id":"attwood-2-3-8-diameter-adjustable-boat-seat-extension-post","title":"attwood adjustable boat seat extension post, 13\" to 19\" height, 2-3\/8\" diameter, marine-grade aluminum","description":"\u003cp\u003e\u003cstrong\u003eThe Attwood SP-37904 is a 2-3\/8\" diameter adjustable boat seat extension post that raises seating between 13\" and 19\" for secure, wobble-free passenger seating on open-water boats.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eReplace or upgrade your boat’s passenger seating hardware with a corrosion-resistant, precision-fit extension post engineered for marine conditions. The SP-37904 uses a satin-anodized, marine-grade aluminum shaft, a proprietary wedge bushing and crush-rib bearing system to lock the post rigidly into the base while allowing smooth height adjustment. It’s certified to ABYC Code B for passenger seating hardware and includes a positive locking tab to prevent accidental detachment. This post is not intended for helm or driver seating.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this post adjust from 13\" to 19\"?\u003c\/h3\u003e\n\u003cp\u003eThe post features a built-in height adjustment mechanism that telescopes within the 2-3\/8\" diameter tube, letting you set seat height anywhere between 13\" and 19\". Adjustment is smooth and secure so you can change seating height quickly without compromising stability.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e13\"–19\" adjustable range for flexible seating positions\u003c\/li\u003e\n  \u003cli\u003eTelescoping inner tube with positive stop locations\u003c\/li\u003e\n  \u003cli\u003eEasy manual adjustment—no special tools required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat keeps the post stable and wobble-free?\u003c\/h3\u003e\n\u003cp\u003eStability comes from an advanced peripheral bearing system with individually sized crush ribs that create a tight, exact fit inside the base. A secure wedge bushing further locks the post into place and an integrated locking tab prevents unexpected disengagement, so seats remain solid while underway.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePeripheral bearing with crush ribs eliminates play\u003c\/li\u003e\n  \u003cli\u003eWedge bushing secures the post into the base\u003c\/li\u003e\n  \u003cli\u003eLocking tab provides positive retention for safety\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this post durable in saltwater and harsh weather?\u003c\/h3\u003e\n\u003cp\u003eThe SP-37904 is machined from high-strength marine-grade aluminum with a satin anodized finish designed to resist corrosion from salt, sun and spray. That finish plus robust construction reduces long-term wear and preserves a clean appearance on exposed deck installations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMarine-grade aluminum core for structural strength\u003c\/li\u003e\n  \u003cli\u003eSatin anodized surface for enhanced corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eDesigned to withstand repeated marine exposure and weathering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDoes it meet safety standards and where should it be used?\u003c\/h3\u003e\n\u003cp\u003eThis extension post is fully certified to ABYC Code B for passenger seating hardware and is intended for passenger seats on open-water boats. It is explicitly not rated for helm or driver seats; use it only on approved passenger seating mounts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eABYC Code B certified for passenger boat seating hardware\u003c\/li\u003e\n  \u003cli\u003eNot intended for helm or driver use\u003c\/li\u003e\n  \u003cli\u003eCompatible with bases designed for 2-3\/8\" diameter posts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Boaters who need a dependable, adjustable seating post for passenger stations—fishing and recreational vessels, charter operators, and anyone replacing worn or corroded passenger seat posts. If you want precise height control, a secure locked fit and long-lasting corrosion resistance in a compact 2-3\/8\" diameter package (model SP-37904), this post is built for that purpose.\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 this post be used for helm or driver seats?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The SP-37904 is certified for passenger seating only and is not rated for helm\/driver use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What diameter and height range does this post support?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is a 2-3\/8\" diameter post with an adjustable height range from 13\" to 19\".\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"attwood","offers":[{"title":"Default Title","offer_id":48031026315425,"sku":"B001O0DIY0","price":319.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/6532\/5729\/files\/attwood-front-view-seat-post_d4b4bb4d-0384-4c27-931c-48d89c8cd54b.jpg?v=1791419796","url":"https:\/\/canadiansporting.ca\/products\/attwood-2-3-8-diameter-adjustable-boat-seat-extension-post","provider":"Canadian Sporting","version":"1.0","type":"link"}