{"product_id":"flame-king-acr-2-auto-changeover-propane-regulator-without-pigtails-2-stage-low-pressure-for-rvs","title":"Flame King ACR-2 Auto Changeover Propane Regulator Without Pigtails — 2-Stage Low-Pressure for RVs","description":"\u003cp\u003e\u003cstrong\u003eFlame King ACR-2 is a two-stage automatic changeover propane regulator that keeps gas flowing from a reserve tank while you swap an empty cylinder, designed for RVs, trailers and vans.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis regulator is built for dual-tank propane systems on mobile homes and recreational vehicles, switching seamlessly from the primary cylinder to the backup when pressure drops. It is UL listed, factory set to a stable low-pressure output, and engineered to preserve constant delivery under varying demand. The ACR-2 ships without pigtails so you can choose the correct hose length and fitting for your installation.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the regulator switch between tanks?\u003c\/h3\u003e\n\u003cp\u003eThe ACR-2 senses pressure loss from the primary tank and automatically opens the reserve side so appliances continue running without interruption. No manual valve changeover is required, making refills more convenient while you travel.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatic changeover activates when primary tank pressure falls to lockout threshold.\u003c\/li\u003e\n  \u003cli\u003eTwo-stage design keeps outlet pressure stable during the switch.\u003c\/li\u003e\n  \u003cli\u003eAllows removal and refill of the empty cylinder without shutting off gas supply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat pressure and connection types does it use?\u003c\/h3\u003e\n\u003cp\u003eThis model is factory set to deliver low pressure suitable for typical RV appliances, with a rated capacity that handles high combined BTU loads. Inlet and outlet threads follow common RV standards, but it arrives without pigtails so you can match your vehicle’s hose lengths and fittings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFactory set outlet: 11 inches water column (approx. low-pressure setting).\u003c\/li\u003e\n  \u003cli\u003eLockout pressure up to 14.9 inches WC; rated throughput up to 345,200 BTU.\u003c\/li\u003e\n  \u003cli\u003eInlets: 1\/4\" SAE inverted flare. Outlet: 3\/8\" NPT female pipe thread.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose a two-stage regulator instead of a single-stage?\u003c\/h3\u003e\n\u003cp\u003eTwo-stage regulators reduce pressure fluctuations when demand changes, so burners and appliances get a steadier flow and are less likely to soot or starve during heavy use. This improves performance when multiple appliances run at once or when ambient temperature affects cylinder pressure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFirst stage drops bulk tank pressure; second stage fine-tunes to appliance-ready output.\u003c\/li\u003e\n  \u003cli\u003eImproved stability under varying loads and weather conditions.\u003c\/li\u003e\n  \u003cli\u003eFactory calibration reduces the need for field adjustments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install and which hoses work best?\u003c\/h3\u003e\n\u003cp\u003eThe regulator is compatible with Flame King inverted-flare pigtails and a recommended thermo plastic hose for flexible routing. It’s assembled with thread-locker on adapter connections to keep fittings secure and prevent leaks, so follow torque and sealing guidance during installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Flame King 48-inch Thermo Plastic Hose (model 100383-48).\u003c\/li\u003e\n  \u003cli\u003eWorks with 12–18 inch inverted flare pigtails (models E12INPT, E15INPT, E18INPT).\u003c\/li\u003e\n  \u003cli\u003eNote: NPT-style pigtails are not recommended; regulator arrives without pigtails so you can select proper lengths.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Flame King ACR-2 is intended for RV owners, vanlifers, and trailer users who run dual-tank propane systems and want uninterrupted gas for cooking, heating, and hot water while swapping cylinders. It suits installers and DIYers who prefer to select their own hose lengths and fittings, and anyone who needs a UL-listed, two-stage regulator rated for high BTU demands and consistent low-pressure output.\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 replace this regulator with my existing single-stage unit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, if your system uses dual tanks and matching fittings; ensure inverted flare inlet and 3\/8\" NPT outlet compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are pigtails included with the ACR-2?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, the ACR-2 ships without pigtails so you can install the correct hose length and fitting for your setup.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Flame King","offers":[{"title":"Default Title","offer_id":55168333119831,"sku":"B00HS599O8","price":47.26,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/flame-king-acr2-front-view.jpg?v=1790400636","url":"https:\/\/britishgarage.co.uk\/products\/flame-king-acr-2-auto-changeover-propane-regulator-without-pigtails-2-stage-low-pressure-for-rvs","provider":"British Garage","version":"1.0","type":"link"}