Refillable 30 lb steel propane cylinder with OPD safety valve, built-in gas level gauge, powder-coated finish, and pre-purged vacuum-ready design for RV, trailer, grill, heater, and outdoor propane use.
The Flame King YSN330 is a 30 lb refillable propane cylinder designed for RVs, trailers, grills, propane heaters, outdoor cooking, camping, and general portable LP gas use. It includes an OPD valve to help prevent overfilling and a built-in gas gauge so users can monitor the approximate propane level without removing the cylinder from service.
This cylinder is built from high-grade welded steel with a powder-coated finish for rust prevention. It arrives empty, pre-purged, and vacuum-ready for filling, helping avoid the extra purge step normally required with many new propane cylinders.
Large refillable propane cylinder for RVs, trailers, grills, heaters, and outdoor use
Overfill Prevention Device valve helps prevent overfilling during proper filling service
Integrated gas level gauge helps monitor approximate propane level
Arrives empty, pre-purged, and vacuum-ready for filling with propane
This cylinder ships empty and must be filled by a qualified propane filling station before use. Do not attempt to fill, modify, transport, store, or connect a propane cylinder in a way that violates local codes, propane supplier requirements, DOT/TC cylinder regulations, or appliance instructions. Built-in gauges provide helpful level indication, but they should not replace proper filling by weight, leak checks, valve inspection, or safe propane handling practices.
Before Filling or Use: Confirm the propane appliance, regulator, hose, cylinder tray, hold-down bracket, compartment clearance, and LP connection are compatible with a 30 lb vertical DOT propane cylinder. This cylinder ships empty and must be filled by a qualified propane supplier before use. Basic Use Steps: 1. Inspect the Cylinder: Check for shipping damage, valve damage, dents, rust, missing markings, or damaged threads before filling. 2. Have It Filled Properly: Take the empty cylinder to a qualified propane filling station. Filling should be completed by trained personnel using proper scale and safety procedures. 3. Secure the Cylinder: Install the cylinder upright in a properly ventilated and approved cylinder location, tray, rack, or bracket. 4. Connect the Regulator/Hose: Attach only compatible propane regulators, hoses, and fittings. Do not force threads or use damaged fittings. 5. Leak Check: Perform a leak check with approved leak detection solution after filling or reconnecting. Never use an open flame to check for leaks. 6. Open Valve Slowly: Open the service valve slowly and follow the connected appliance’s lighting or operating instructions. 7. Monitor Fuel Level: Use the built-in gauge as a helpful reference for approximate propane level. 8. Store Safely: Store upright, outdoors or in approved ventilated areas, away from heat, ignition sources, and enclosed living spaces.
Package Contents: • 1 Flame King YSN330 30 lb steel propane cylinder • OPD valve installed • Built-in gas level gauge • Pre-purged / vacuum-ready empty cylinder as supplied by manufacturer packaging NOT Included — May Also Need: • Propane fuel fill • Propane regulator • Propane hose or pigtail • Cylinder mounting tray, rack, bracket, or hold-down strap • RV automatic changeover regulator or LP manifold parts • Protective cylinder cover • Leak detection solution • Appliance-specific fittings or adapters This listing is for the empty refillable propane cylinder only unless otherwise stated. Confirm all connection parts and mounting requirements before ordering.
To confirm compatibility before ordering, have the following ready: • Current cylinder size and capacity • Available height and diameter clearance in the LP compartment or tray • Cylinder hold-down style and mounting space • Regulator and hose/pigtail connection type • Whether the application requires a vertical DOT cylinder • RV, trailer, grill, heater, or appliance propane connection details • Any local propane supplier requirements for filling portable cylinders Why this matters: A 30 lb cylinder is taller and heavier than a 20 lb cylinder. Always confirm physical clearance, mounting security, hose reach, regulator compatibility, and safe ventilation before use.
Match this cylinder by propane capacity, cylinder dimensions, mounting clearance, regulator/hose compatibility, valve requirements, and safe storage/transport needs. Do not select by capacity alone.
If propane flow or appliance operation problems continue, check fill level, valve operation, regulator, hose, fittings, leak status, appliance requirements, and safe cylinder mounting before use.
Propane is flammable and must be handled carefully. Always transport and store cylinders upright and secured, use only in well-ventilated approved locations, keep away from ignition sources, and never store propane cylinders inside living spaces. Do not overfill, modify, repair, or use damaged cylinders. If propane odor is detected, close the valve if safe to do so, ventilate the area, avoid flames/sparks/electrical switches, and have the system inspected before use.