{"id":4347,"date":"2025-08-11T21:13:45","date_gmt":"2025-08-12T04:13:45","guid":{"rendered":"https:\/\/www.accordionboot.com\/shop\/?post_type=product&#038;p=4347"},"modified":"2025-08-11T21:13:45","modified_gmt":"2025-08-12T04:13:45","slug":"firewall-wire-boot-universal-cable-pass-through-seal","status":"publish","type":"product","link":"https:\/\/www.accordionboot.com\/shop\/product\/firewall-wire-boot-universal-cable-pass-through-seal\/","title":{"rendered":"Firewall Wire Boot \u2013 Universal Cable Pass-Through Seal"},"content":{"rendered":"<p>Route wiring, air lines, or sensor hoses through a metal firewall or bulkhead without leaks or abrasion. The <strong>Daystar KU20040BK Firewall Wire Boot<\/strong> provides a clean, protected pass-through for <strong>3\/8\u2033 to 1\u2033<\/strong> bundles. Drill a <strong>1.25\u2033<\/strong> pilot hole, seat the boot, trim to fit, and cinch with a zip tie. Made in the USA.<\/p>\n<h2>Key Features<\/h2>\n<ul>\n<li><strong>Universal Fit:<\/strong> Accommodates wire\/tube bundles from <strong>3\/8\u2033\u20131\u2033<\/strong><\/li>\n<li><strong>Leak-Resistant Seal:<\/strong> Helps block air\/water intrusion through firewall penetrations<\/li>\n<li><strong>Edge Protection:<\/strong> Shields insulation from sharp metal to reduce chafing and shorts<\/li>\n<li><strong>Fast Install:<\/strong> 1.25\u2033 hole, trim-to-fit opening, secure with zip tie<\/li>\n<li><strong>Durable Construction:<\/strong> Heat-resistant, automotive-grade elastomer; <em>Made in USA<\/em><\/li>\n<\/ul>\n<h2>Perfect For<\/h2>\n<ul>\n<li>Truck accessories, lighting, and upfitting<\/li>\n<li>DIY Box truck, overland vehicle conversions and pass-throughs<\/li>\n<li>Car audio power\/ground, DSP, and sensor wiring<\/li>\n<li>Air systems (on-board air, lockers) and auxiliary plumbing<\/li>\n<\/ul>\n<h2>Specifications<\/h2>\n<table>\n<tbody>\n<tr>\n<td><strong>Brand<\/strong><\/td>\n<td>Daystar<\/td>\n<\/tr>\n<tr>\n<td><strong>Part #<\/strong><\/td>\n<td>KU20040BK (Single)<\/td>\n<\/tr>\n<tr>\n<td><strong>Fit Range<\/strong><\/td>\n<td>3\/8\u2033 \u2013 1\u2033 wire\/tube bundles<\/td>\n<\/tr>\n<tr>\n<td><strong>Pilot Hole<\/strong><\/td>\n<td>1.25\u2033 (32 mm) in firewall\/bulkhead<\/td>\n<\/tr>\n<tr>\n<td><strong>Closure<\/strong><\/td>\n<td>Trim-to-fit opening + zip tie<\/td>\n<\/tr>\n<tr>\n<td><strong>Material<\/strong><\/td>\n<td>Automotive-grade elastomer (heat-resistant)<\/td>\n<\/tr>\n<tr>\n<td><strong>Country<\/strong><\/td>\n<td>USA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Installation Overview<\/h2>\n<ol>\n<li>Plan the routing. Verify clearance on both sides of the firewall and avoid OEM harnesses\/lines.<\/li>\n<li>Drill a <strong>1.25\u2033<\/strong> hole; deburr edges.<\/li>\n<li>Press the boot into the hole until fully seated.<\/li>\n<li>Pass your wiring\/hoses through the slit; <strong>trim the opening<\/strong> to match bundle diameter (3\/8\u2033\u20131\u2033).<\/li>\n<li>Cinch the neck with a <strong>zip tie<\/strong> for a tight seal. Test for chafe-free clearance and leaks.<\/li>\n<\/ol>\n<h2>What\u2019s In the Box<\/h2>\n<ul>\n<li>(1) Daystar Firewall Wire Boot \u2013 KU20040BK<\/li>\n<li>(1) Zip tie<\/li>\n<\/ul>\n<h2>Single vs. 5-Pack<\/h2>\n<p>Need to outfit multiple pass-throughs? Choose the <a href=\"https:\/\/amzn.to\/40YYiEC\" target=\"_blank\" rel=\"noopener\"><strong>KU20041BK (5-Pack)<\/strong><\/a> for shops or complex builds. Same sizing\/installation\u2014better unit cost per boot.<\/p>\n<h2>FAQs<\/h2>\n<h3>Will it work for hoses?<\/h3>\n<p>Yes\u2014within the 3\/8\u2033\u20131\u2033 range. Ensure the hose OD matches and trim the opening for a snug seal.<\/p>\n<h3>What if I already have a factory hole?<\/h3>\n<p>If the existing hole is near 1.25\u2033 and the sheet metal is sound, you can deburr and install the boot there.<\/p>\n<h3>Heat exposure?<\/h3>\n<p>The boot is heat-resistant for typical engine-bay duty. Avoid direct contact with exhaust components.<\/p>\n<div class=\"tcq-cta\">\n<p><strong>Ready to add a clean, sealed pass-through?<\/strong><\/p>\n<p>\n    <a class=\"button\" href=\"https:\/\/amzn.to\/40X8Fsw\" target=\"_blank\" rel=\"nofollow sponsored noopener\"><br \/>\n      Buy Daystar KU20040BK on Amazon<br \/>\n    <\/a>\n  <\/p>\n<p class=\"disclosure\" style=\"font-size:0.9em;opacity:.85;\">\n    Disclosure: As an Amazon Associate, we may earn from qualifying purchases. This does not affect your price.\n  <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p><strong>Firewall Wire Boot \u2013 Daystar KU20040BK<\/strong><br \/>\nUniversal, trim-to-fit pass-through for wiring or hoses. Fits 3\/8\u2033\u20131\u2033 bundles with a tight, leak-resistant seal. Installs in a 1.25\u2033 hole\u2014ideal for trucks, DIY RV builds, and car audio.<\/p>\n","protected":false},"featured_media":4348,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[66],"product_tag":[],"class_list":{"0":"post-4347","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-accordion-boot","8":"first","9":"instock","10":"taxable","11":"shipping-taxable","12":"product-type-external"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Firewall Wire Boot \u2013 Universal Cable Pass-Through Seal<\/title>\n<meta name=\"description\" content=\"Protect and seal wires with the Daystar KU20040BK Firewall Wire Boot. Universal fit for 3\/8\u2033\u20131\u2033 bundles. 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Easy install for trucks, RVs, and car audio.","og_url":"https:\/\/www.accordionboot.com\/shop\/product\/firewall-wire-boot-universal-cable-pass-through-seal\/","og_site_name":"Accordion Boot Store","article_publisher":"http:\/\/www.facebook.com\/pages\/Accordion-Boot\/226752504004202","og_image":[{"width":1164,"height":661,"url":"https:\/\/www.accordionboot.com\/shop\/wp-content\/uploads\/2025\/08\/firewall-wire-boot-daystar-ku20040bk-hero.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_site":"@accordionboot","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.accordionboot.com\/shop\/product\/firewall-wire-boot-universal-cable-pass-through-seal\/","url":"https:\/\/www.accordionboot.com\/shop\/product\/firewall-wire-boot-universal-cable-pass-through-seal\/","name":"Firewall Wire Boot \u2013 Universal Cable Pass-Through Seal","isPartOf":{"@id":"https:\/\/www.accordionboot.com\/shop\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.accordionboot.com\/shop\/product\/firewall-wire-boot-universal-cable-pass-through-seal\/#primaryimage"},"image":{"@id":"https:\/\/www.accordionboot.com\/shop\/product\/firewall-wire-boot-universal-cable-pass-through-seal\/#primaryimage"},"thumbnailUrl":"https:\/\/www.accordionboot.com\/shop\/wp-content\/uploads\/2025\/08\/firewall-wire-boot-daystar-ku20040bk-hero.jpg","datePublished":"2025-08-12T04:13:45+00:00","description":"Protect and seal wires with the Daystar KU20040BK Firewall Wire Boot. 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