{"product_id":"master-lock-trailer-coupler-lock-379atpy-black-universal-fit-1-7-8-2-5-16-in-zinc-keyed","title":"Master Lock Trailer Coupler Lock 379ATPY Black — Universal Fit 1-7\/8–2-5\/16 in, Zinc Keyed","description":"\u003cp\u003e\u003cstrong\u003eThe Master Lock 379ATPY is a universal trailer coupler lock that blocks unauthorized hitching by fitting the most common coupler sizes and providing keyed, corrosion-resistant protection.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eKeep your trailer, camper, boat, or utility equipment from being hitched without permission with a compact, visible towing security device. The 379ATPY is made to fit 1-7\/8 in., 2 in., and most 2-5\/16 in. trailer couplers, uses a keyed locking mechanism designed to resist tampering, and features zinc construction for weather resistance. It ships with two keys so you can keep a spare where you need it.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this lock prevent unauthorized coupling?\u003c\/h3\u003e\n\u003cp\u003eThe 379ATPY physically blocks the coupler latch area so another vehicle cannot connect to your trailer. Its keyed lock is engineered to resist picking and prying, creating a visible deterrent that reduces opportunistic theft.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid locking bar covers latch opening to stop hitch engagement\u003c\/li\u003e\n  \u003cli\u003eKeyed cylinder built to make picking difficult\u003c\/li\u003e\n  \u003cli\u003eHigh-visibility black finish signals a secured trailer\u003c\/li\u003e\n  \u003cli\u003eIncludes two keys for immediate use and a spare\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it fit my trailer's coupler sizes?\u003c\/h3\u003e\n\u003cp\u003eThis coupler lock was designed as a universal option for the most frequently used couplers. It fits 1-7\/8 in. (48 mm), 2 in. (51 mm), and most 2-5\/16 in. (59 mm) trailer couplers, covering a wide range of utility, boat, and camper trailers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with standard round ball couplers in listed sizes\u003c\/li\u003e\n  \u003cli\u003eWorks with many RVs, boat trailers, utility trailers, and campers\u003c\/li\u003e\n  \u003cli\u003eCompact profile fits common latch geometries without modification\u003c\/li\u003e\n  \u003cli\u003eUniversal fit reduces the need for multiple locks across trailers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is it for outdoor use?\u003c\/h3\u003e\n\u003cp\u003eThe lock's zinc construction helps resist rust and corrosion from rain, road splash, and marine environments. Built for frequent outdoor exposure, it offers long-lasting performance when stored on the hitch between trips or left on trailers during seasonal storage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eZinc body resists corrosion in wet or coastal conditions\u003c\/li\u003e\n  \u003cli\u003eSolid-metal components withstand outdoor storage and handling\u003c\/li\u003e\n  \u003cli\u003eBlack finish reduces visible wear and integrates with tow setups\u003c\/li\u003e\n  \u003cli\u003eSmall size is easy to stow with other hitch accessories\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the package and how do I use it?\u003c\/h3\u003e\n\u003cp\u003eOut of the box you get the keyed coupler lock and two keys, so you can secure the trailer immediately and keep a spare key accessible. Installation is tool-free: position the lock over the coupler latch area and turn the key to lock it in place.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes the Master Lock 379ATPY coupler lock and two keys\u003c\/li\u003e\n  \u003cli\u003eTool-free installation — slide into place and turn key to secure\u003c\/li\u003e\n  \u003cli\u003eCompact for easy transport with other towing accessories\u003c\/li\u003e\n  \u003cli\u003eVisible deterrent for parking lots, driveways, campsites, and storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this lock is for: The Master Lock 379ATPY is aimed at trailer owners who want a straightforward, visible way to help prevent unauthorized hitching—ideal for owners of boat trailers, utility trailers, campers, RVs, and jobsite trailers. If you need a compact, weather-resistant coupler lock with a universal fit and keyed security, this model provides a practical, ready-to-use option.\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: Does the 379ATPY fit a 2-5\/16 in coupler?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the 379ATPY fits 1-7\/8 in, 2 in, and most 2-5\/16 in couplers for broad compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are spare keys included?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the lock ships with two keys so you have a spare for convenient access.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Master Lock","offers":[{"title":"Default Title","offer_id":67587118923961,"sku":"B000L9QRE8","price":96.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/masterlock-front-view-trailer-lock.jpg?v=1790500060","url":"https:\/\/redleafauto.ca\/products\/master-lock-trailer-coupler-lock-379atpy-black-universal-fit-1-7-8-2-5-16-in-zinc-keyed","provider":"Redleaf Auto","version":"1.0","type":"link"}