{"product_id":"flame-king-2-stage-automatic-changeover-propane-regulator-acr-2a-dual-cylinder-rv-regulator-11-wc-output","title":"Flame King 2-Stage Automatic Changeover Propane Regulator ACR-2a — Dual-Cylinder RV Regulator, 11\" WC Output","description":"\u003cp\u003e\u003cstrong\u003eFlame King ACR-2a is a two-stage automatic changeover propane regulator that keeps gas flowing from a backup cylinder while you remove or refill the empty tank.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact, UL-listed regulator is built for RVs, vans, and trailers with dual-cylinder setups. It automatically switches from the primary cylinder to the reserve when pressure drops, maintains steady downstream pressure under varying demand, and is factory-set for 11\" WC output with a lockout near 14.9\" WC. Designed for reliability and user convenience, the unit accepts 1\/4\" SAE inverted flare inlets and delivers through a 3\/8\" NPT female outlet. The ACR-2a ships without pigtails so you can pair it with Flame King’s approved hoses and pigtails to match your RV installation.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this regulator keep propane flowing during a tank change?\u003c\/h3\u003e\n\u003cp\u003eThe ACR-2a monitors upstream pressure and automatically moves supply to the reserve cylinder when the primary is depleted. This means you can remove and refill the empty bottle without interrupting appliances. It includes a lockout to prevent draw from an over-pressurized or faulty cylinder.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatic switching between primary and reserve tanks\u003c\/li\u003e\n  \u003cli\u003eAllows cylinder removal without shutting off appliances\u003c\/li\u003e\n  \u003cli\u003eBuilt-in lockout pressure to block unsafe sources\u003c\/li\u003e\n  \u003cli\u003eWorks with standard dual-tank RV layouts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the performance specs and connections I need to know?\u003c\/h3\u003e\n\u003cp\u003eThe regulator is rated for up to 345,200 BTU and uses a two-stage design to maintain stable downstream pressure. Inlets are 1\/4\" SAE inverted flare and the outlet is 3\/8\" NPT female pipe thread, giving compatibility with common RV fittings when paired with proper pigtails or hoses.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFactory set to 11\" WC output; lockout near 14.9\" WC\u003c\/li\u003e\n  \u003cli\u003eRated capacity: 345,200 BTU\u003c\/li\u003e\n  \u003cli\u003eInlets: 1\/4\" SAE inverted flare; outlet: 3\/8\" NPT female\u003c\/li\u003e\n  \u003cli\u003eTwo-stage design for steady pressure under changing loads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich hoses and pigtails should I use with the ACR-2a?\u003c\/h3\u003e\n\u003cp\u003eThis regulator is shipped without pigtails so you can select the correct lengths and fittings for your installation. Flame King recommends specific inverted-flare pigtails and a 48\" thermoplastic hose to match common RV layouts while avoiding NPT pigtails.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Flame King 48\" Thermo Plastic Hose (Model 100383-48)\u003c\/li\u003e\n  \u003cli\u003eWorks with 12–18\" inverted-flare pigtails (Models E12INPT, E15INPT, E18INPT)\u003c\/li\u003e\n  \u003cli\u003eAvoid using NPT pigtails as they are not recommended for this connection\u003c\/li\u003e\n  \u003cli\u003eSelect pigtail length to prevent stress on fittings and simplify tank swaps\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat safety and installation details should I consider?\u003c\/h3\u003e\n\u003cp\u003eFlame King assembles critical adapter connections with high-strength thread locker to secure fittings and reduce leak risk. Always follow local codes and RV manufacturer guidance when installing regulators, and use qualified technicians if you’re unsure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCritical connections use thread-locker (Loctite) to resist loosening\u003c\/li\u003e\n  \u003cli\u003eUL listed design and rated capacity for RV systems\u003c\/li\u003e\n  \u003cli\u003eInstall in a well-ventilated area away from ignition sources\u003c\/li\u003e\n  \u003cli\u003eFollow local codes and use approved hoses and connectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Flame King ACR-2a is ideal for RV, van, and trailer owners who run dual propane cylinders and want uninterrupted gas service during tank swaps. It suits DIY installers familiar with RV propane systems and professional installers looking for a reliable, UL-listed automatic changeover regulator. If you need continuous appliance operation, steady pressure under varying loads, and compatibility with standard inverted-flare fittings, this regulator is engineered to fit those requirements.\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 I use NPT pigtails with the ACR-2a?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: NPT pigtails are not recommended. Use inverted-flare pigtails or Flame King approved hoses for safe, leak-free connections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What pressure is the regulator set to?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The ACR-2a is factory-set to 11\" WC output with a lockout around 14.9\" WC and is rated for 345,200 BTU.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Flame King","offers":[{"title":"Default Title","offer_id":48083203326110,"sku":"B08XYH1JS7","price":51.42,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/flame-king-acr-2a-front-view.jpg?v=1785828425","url":"https:\/\/northtrailauto.ca\/products\/flame-king-2-stage-automatic-changeover-propane-regulator-acr-2a-dual-cylinder-rv-regulator-11-wc-output","provider":"North Trail Auto","version":"1.0","type":"link"}