Buying a used propane tank can save you hundreds of dollars—but only if you know what to inspect before you buy. A poorly maintained tank can lead to leaks, safety hazards, and costly repairs.
In this guide, we’ll cover the top 5 things to check when you shop for used propane tanks for sale and share tips for a safe purchase.
1. Certification and Hydrostatic Test Date
Propane tanks must be re-certified every 10 years via a hydrostatic pressure test. Look for:
- Stamped test date on the collar
- “DOT 4BA” stamp for vertical tanks or “DOT 4BW” for horizontal
- Tanks beyond their test date need re-certification before use
2. Exterior Condition and Corrosion
Inspect the shell and collar for:
- Rust spots or peeling paint
- Dents that may compromise integrity
- Severe pitting or perforations (discard if present)
3. Valve and Regulator Integrity
Check the valve assembly:
- Valve opens and closes smoothly
- No signs of leakage or hissing
- Regulator (if included) is not cracked or damaged
4. Tank Size and Capacity Markings
Ensure the capacity matches your needs:
- Common sizes: 100, 250, 500, 1000 gallon
- Check stamped capacity marking on the side
- Verify tare weight for accurate fill calculations
5. Pressure Relief Device (PRD)
The PRD is critical for safety—ensure it’s:
- Present and unmodified
- Free of paint obstruction
- Not corroded or damaged
Bonus Tip: Ask for Maintenance Records
If possible, request any service or inspection records. A well-documented history often means better care and reliability.
Where to Find Reliable Used Propane Tanks
At Trailtainer, we carry a selection of tested, certified used propane tanks in sizes from 100 to 2000 gallons. Each tank undergoes a full inspection and hydrostatic test before sale.
Browse Used Propane Tanks →
Contact Us for Inspection Reports →
Final Thoughts
Buying a used propane tank doesn’t have to be risky. By focusing on certification dates, structural integrity, and safety devices, you can secure a great deal and ensure years of safe service.