{"product_id":"3-3-4-oil-cap-w-o-ring-plug-10k-16000-hayes-alko-rockwell-trailer-axle","title":"Rockwell 3.75\" Oil Cap Assembly for 9K–16K Drums (RW12011-1)","description":"\u003cdiv style=\"font-family: Helvetica Neue,Helvetica,Arial,sans-serif !important;\"\u003e\n\u003c!-- LOGO --\u003e\u003ccenter style=\"margin-bottom: 20px;\"\u003e\u003cimg style=\"max-width: 200px; height: auto;\" alt=\"R \u0026amp; P Carriages Logo\" src=\"https:\/\/needatrailerpart.com\/cdn\/shop\/files\/LOGO-FINAL-NOSHAPE_1512x.png?v=1761071583\"\u003e\u003c\/center\u003e\n\u003c!-- PRODUCT TITLE --\u003e\u003ccenter\u003e\n\u003ch1 style=\"color: #000; font-size: 32px; font-weight: bold; margin-bottom: 10px;\"\u003eRockwell 3.75\" Oil Cap Assembly – Fits 9K–16K Drums (RW12011-1)\u003c\/h1\u003e\n\u003cp style=\"color: #444; margin-top: -8px; font-size: 15px;\"\u003ePart Number: RW12011-1\u003c\/p\u003e\n\u003c\/center\u003e\n\u003c!-- INTRO --\u003e\n\u003cp style=\"color: #333; line-height: 1.6; margin-top: 16px;\"\u003eThis is a \u003cstrong\u003esingle\u003c\/strong\u003e Rockwell-style 3.75\" oil cap assembly used on many 9,000–16,000 lb Rockwell American hubs and drums manufactured after 1996. It replaces Rockwell part number \u003cstrong\u003e12011-1\u003c\/strong\u003e and is also used on some Kodiak disc brake hubs that accept a 3.75\" oil cap.\u003c\/p\u003e\n\u003c!-- FEATURES --\u003e\n\u003ch2 style=\"color: #000; font-size: 20px; margin-top: 22px; margin-bottom: 10px;\"\u003eFeatures\u003c\/h2\u003e\n\u003cul style=\"color: #333; line-height: 1.6; margin-top: 0; margin-bottom: 16px;\"\u003e\n\u003cli\u003eSingle replacement oil cap assembly for Rockwell hubs\u003c\/li\u003e\n\u003cli\u003eFits many 9K–16K Rockwell American axle drum applications\u003c\/li\u003e\n\u003cli\u003e3.75\" OD with 8 TPI thread\u003c\/li\u003e\n\u003cli\u003eIncludes clear sight lens, plug, and O-ring\u003c\/li\u003e\n\u003cli\u003eCommon on Rockwell American hubs built after 1996\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- SPECIFICATIONS --\u003e\n\u003ch2 style=\"color: #000; font-size: 20px; margin-top: 22px; margin-bottom: 10px;\"\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #eaeaea;\"\u003e\n\u003cth style=\"padding: 6px; border: 1px solid #ccc;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding: 6px; border: 1px solid #ccc;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eThread Diameter\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003e3.75\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eThread Pitch\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003e8 TPI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eAxle Range\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eTypically used on 9K–16K Rockwell axles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eReplaces\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eRockwell 12011-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eIncluded Components\u003c\/td\u003e\n\u003ctd style=\"padding: 6px; border: 1px solid #ccc;\"\u003eCap, sight lens, center plug, O-ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- OPTIONAL NOTES --\u003e\n\u003cp style=\"color: #333; line-height: 1.6; margin-top: 20px;\"\u003eFitment varies by axle and hub manufacturer. Always compare thread diameter, pitch, and O-ring seat dimensions with your existing cap before installation.\u003c\/p\u003e\n\u003c!-- COLLECTION BUTTON --\u003e\u003ccenter style=\"margin-top: 24px;\"\u003e\u003ca style=\"background: #000; color: #fff; text-decoration: none; padding: 10px 18px; border-radius: 5px; font-weight: 600; display: inline-block; font-family: Helvetica,Arial,sans-serif;\" href=\"https:\/\/needatrailerpart.com\/search?q=oil+cap\"\u003e View More Oil Cap Parts \u003c\/a\u003e\u003c\/center\u003e\n\u003c\/div\u003e","brand":"R \u0026 P Carriages","offers":[{"title":"Default Title","offer_id":9805926105130,"sku":"RW12011-1","price":26.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/products\/s-l1600_c98c0426-5a23-46ec-9491-344c179b2b1b.jpg?v=1727273089","url":"https:\/\/needatrailerpart.com\/products\/3-3-4-oil-cap-w-o-ring-plug-10k-16000-hayes-alko-rockwell-trailer-axle","provider":"Need a Trailer Part","version":"1.0","type":"link"}