Flame King 18" Solid Rubber Pigtail Hose for RV Regulators — Type 1 ACME to 1/4" Male NPT, 400,000 BTU

Flame King's 18-inch solid rubber pigtail with a Type 1 ACME nut and 1/4" male NPT end connects a refillable propane cylinder to an RV or trailer regulator while delivering high BTU capacity and built-in safety features.

This 18" pigtail hose from Flame King is built to join a 20 lb or 30 lb refillable propane tank to an RV or trailer regulator or to act as an auxiliary feed for a 4-port brass tee. It uses a Type 1 ACME cylinder nut on one end and a 1/4" male NPT fitting (not a flare) on the other. The assembly is manufactured with a solid rubber hose and brass fittings to withstand heavy-duty recreational and mobile applications where consistent fuel flow and safety are required.

How much propane flow and pressure can this pigtail handle?

The Flame King pigtail is engineered for high flow and durable pressure handling suitable for many RV systems. Its capacity supports substantial appliance draw while the coupler and hose have distinct pressure ratings to match installation needs.

• Flow capacity: rated for 400,000 BTU per hour
• Coupler pressure rating: maximum 250 PSI
• Hose pressure rating: maximum 350 PSI
• Designed for regular RV appliance demands and auxiliary supply lines

What fittings are on each end, and will it fit my regulator?

This model uses a Type 1 ACME nut on the cylinder side and a 1/4" male NPT on the regulator end—note that the NPT is not a flare connection. It works with regulators and tees that accept a 1/4" male NPT input, and is compatible with standard refillable 20 lb or 30 lb tanks that use an ACME nut.

• Cylinder side: Type 1 ACME nut (common on refillable tanks)
• Regulator side: 1/4" male NPT (not compatible with flare fittings)
• Use with regulators or 4-port brass tees accepting 1/4" NPT
• Not intended for disposable cylinder valves or flare-only systems

What safety features are included and why do they matter?

The pigtail includes protective mechanisms to reduce risk during abnormal events. A thermal protection element and excess flow protection help limit fuel delivery in fire or rupture scenarios, reducing hazards and potential damage to the system.

• Thermal protection engages in elevated temperature conditions
• Excess flow protection restricts fuel if a line breaks or is severed
• Solid rubber hose and brass fittings resist wear and environmental exposure
• Intended to add redundancy to RV fuel systems when properly installed

How long is the hose and what installation uses is it best suited for?

The hose measures 18 inches overall, offering a compact, flexible connection between tank and regulator or between regulators and a 4-port tee. Its length is ideal for close-coupled setups, accessory supply lines, or when routing space is limited behind an RV access door.

• Total length: 18 inches for compact routing
• Works well as main regulator feed or auxiliary 4-port tee supply
• Flexible rubber construction eases alignment during install
• Recommended for 20 lb and 30 lb refillable propane cylinders

Who is this for: This Flame King 18" pigtail suits RV owners, trailer technicians, and mobile installers who need a compact, durable propane connection with clear compatibility to ACME cylinder nuts and 1/4" male NPT regulator inputs. Choose this hose when you require a high-BTU-capacity feed line with thermal and excess-flow safety features—ideal for routine RV appliance supply or as an auxiliary line to a 4-port tee when space and reliability matter.