Flame King YSN401 Steel Propane Tank 40 Lb - Refillable, OPD Safety

In this review the Flame King YSN401 40 lb steel propane tank is evaluated for backyard grillers, RV owners, and contractors who need extended runtime without swapping tanks. The bottom line is simple: this empty, pre-purged cylinder delivers dependable capacity and required safety features, with the single biggest reason to buy being its combination of a large 40 lb capacity and an overfill prevention device that most fill stations require. It is a practical choice for anyone who wants fewer tank swaps and standard connections that work with common appliances.

Key Features

• Empty, ready for fill: Arrives pre-purged and vacuum ready so professionals can safely refill it without additional preparation.
• Overfill Prevention: Fitted with an OPD valve that prevents overfilling and ensures compliance with refill requirements in most states.
• Durable construction: Made from high-grade welded steel and powder coated to resist rust for long service life in outdoor settings.
• Certified safety testing: X-ray and hydrostatic tested and certified to DOT and Transport Canada standards for secure transport in the US and Canada.
• Standard connection: Uses a common-size valve so it connects as easily as smaller tanks to RVs, trailers, heaters, and grills.

Who It's For

The Flame King 40 lb tank is ideal for homeowners with large grills, RV and trailer owners needing longer run times, and tradespeople who use propane heaters or torches on job sites. Its capacity is roughly equivalent to two 20 lb tanks, so it reduces refill frequency and handles heavy-duty usage patterns.

Those who should look elsewhere include users who need a permanently mounted tank with custom fittings or those who require non-OPD valves for very specific older equipment; this unit is targeted at refillable, mobile use with standard connections and legal safety features.

Pros & Cons

Pros

• Large 40 lb capacity gives extended runtime and fewer refill trips.
• OPD valve provides required overfill protection and wider refill acceptance.
• Solid welded steel construction and powder coat reduce corrosion risk and extend service life.
• DOT and Transport Canada testing means safe transport across borders and job sites.

Cons

• As an empty cylinder, it requires an initial fill and cannot be used out of the box.
• One reported handling issue noted a bent handle; careful handling during transport is advised.

Specifications

Our Verdict

The Flame King YSN401 40 lb steel propane tank is a practical, value-oriented option for anyone who needs longer run times and reliable safety features. Its OPD valve and certified testing make it widely refillable and safe to transport, and the durable build is suited to outdoor use. Buy it if you want fewer tank swaps and standard compatibility; choose a different solution only if you need factory-filled delivery or custom fittings.

Frequently Asked Questions

Is this tank safe to transport?
Yes. It is X-ray and hydrostatic tested and certified to DOT and Transport Canada standards for safe transport.

Will this connect to my RV or grill?
Yes. The tank uses a standard-size connection valve compatible with common RV, trailer, and grill fittings.

Does it arrive filled?
No. It ships empty, pre-purged and vacuum ready for filling at a certified refill location.