The most common places to refill a CO2 tank

You can refill a CO2 tank at welding supply shops, paintball retailers, aquarium stores, and some sporting goods retailers. The fastest option depends on what you need the tank for and whether you own the tank or are renting it. Most places charge between $15 and $30 per refill, though prices vary by location and tank size.

Welding supply shops are usually the cheapest and most reliable option because CO2 refills are part of their core business. Paintball shops are convenient if you live near one, but they often charge more per refill. Aquarium stores refill tanks for planted tanks and carbonation systems, though they may have longer wait times. Some grocery stores with soda fountain systems also offer refills, but you typically need to ask at the customer service desk.

Key Takeaways

  • Welding supply shops offer the lowest prices and fastest service because CO2 refills are their primary business.
  • Paintball retailers, aquarium stores, and some sporting goods shops also refill tanks, though at higher prices.
  • You will need to bring your tank in person; most places do not offer mail-in refills for safety reasons.
  • Refill times range from same-day service at welding shops to several days at specialty retailers.
  • Some retailers require you to own the tank outright, while others rent tanks and handle refills as part of the rental agreement.

Welding supply shops and industrial gas retailers

Welding supply shops are your best bet for speed, price, and reliability. These businesses stock CO2 in bulk and refill tanks constantly, so they have the equipment and expertise to handle any size tank quickly. Most offer same-day or next-day service, and prices typically run $15 to $25 per refill depending on your tank size and location.

To find a welding supply shop near you, search online for "welding supply" or "industrial gas" plus your city name. Call ahead to confirm they refill CO2 tanks and ask about their current price. Bring your tank in person and have your ID ready — some shops require proof of ownership or a rental agreement if the tank is not registered to you.

National chains like Airgas and Praxair operate welding supply locations in most cities. Local independent shops often have better prices and faster turnaround than chains, so check both options before deciding where to go.

Paintball retailers and sporting goods stores

Paintball shops refill CO2 tanks as a routine service and can usually do it while you wait. Prices run $20 to $35 per refill, higher than welding shops but often lower than specialty retailers. The downside is that paintball shops are less common than welding suppliers, and many are located only in larger cities or shopping centers.

Sporting goods chains like Dick's Sporting Goods sometimes offer CO2 refills at their locations, though availability varies by store. Call your local store first to confirm they have the equipment and can refill your specific tank size. Some stores limit refills to tanks they sold, so ask about their policy before making the trip.

Aquarium stores and specialty retailers

Aquarium stores refill CO2 tanks for planted aquariums and carbonation systems. They typically charge $20 to $40 per refill and may take several days to complete the work because refills are not their primary business. Some aquarium stores require you to purchase a tank from them before they will refill it, so call ahead to confirm their policy.

Specialty retailers like homebrew supply shops, soda fountain equipment dealers, and coffee machine suppliers also refill CO2 tanks. These businesses often charge premium prices because refills are an occasional service rather than their main focus. However, they may be your only option if you live in a rural area or need a very specific tank size.

What to bring and how the refill process works

Bring your tank in person to any refill location. You will need to show the tank itself so the retailer can inspect it for damage, check the valve, and confirm the size. Most places require you to wait while they refill, though some may ask you to leave the tank and pick it up later.

The refill process takes 10 to 30 minutes at most locations. The retailer will connect your tank to their refill equipment, transfer CO2 from their bulk supply into your tank, and test the valve to make sure it seals properly. You pay when the refill is complete and take the tank with you.

Bring your ID and proof of ownership or a rental agreement if the tank is not registered to you. Some retailers ask for this information to comply with safety regulations. If you rented the tank from the retailer, they will refill it as part of your rental agreement, usually for no additional charge beyond the rental fee.

Tank ownership versus rental

You can own your CO2 tank outright or rent one from a retailer. Owned tanks cost $50 to $150 upfront depending on size, then you pay only for refills at any location that accepts your tank type. Rented tanks have no upfront cost, but you pay a monthly rental fee (usually $5 to $15) plus the refill cost, and you can only refill at the retailer you rented from.

If you refill your tank frequently, ownership pays for itself within a few months. If you refill occasionally, renting may be cheaper because you avoid the upfront purchase. Ask the retailer which option makes sense for your situation — they can usually switch you from rental to ownership or vice versa.

Owned tanks are stamped with a date and must be hydro-tested (pressure-tested for safety) every five to ten years depending on your location and tank type. The retailer can tell you when your tank is due for testing and can usually arrange it for $30 to $50. Rented tanks are the retailer's responsibility, so they handle testing as part of the rental agreement.

Finding a refill location near you

Start by searching online for "CO2 refill near me" or "welding supply near me" to see what options exist in your area. Google Maps will show you the locations, hours, and customer reviews. Call ahead to confirm they refill the type and size of tank you have, and ask about their current price and wait time.

If you live in a rural area with no nearby welding shops or paintball retailers, check with aquarium stores, homebrew suppliers, or soda fountain equipment dealers. Some of these businesses can refill your tank even if it is not their primary service. As a last resort, you can order a pre-filled tank online and have it shipped to you, though this is more expensive than a local refill and may not be available in all states due to shipping restrictions on pressurized containers.

Frequently Asked Questions

How long does a CO2 tank refill take?

Most welding supply shops and paintball retailers refill tanks while you wait, usually in 10 to 30 minutes. Aquarium stores and specialty retailers may take several days because refills are not their primary business. Call ahead to ask about their typical turnaround time.

Can I mail my tank to be refilled?

No. CO2 tanks are pressurized containers and cannot be shipped by mail or most courier services due to safety regulations. You must bring your tank in person to a local retailer for refilling.

What if my tank is damaged or the valve does not work?

Most retailers will inspect your tank before refilling and refuse to refill it if the valve is damaged or the tank shows signs of rust or dents. They can usually repair or replace the valve for $20 to $50, or you can purchase a new tank. Ask the retailer what repairs are possible before you decide whether to fix or replace your tank.

Do I need to own the tank to get it refilled?

No. If you rented the tank from a retailer, they will refill it as part of your rental agreement. If you own the tank, you can take it to any retailer that accepts your tank type. Some retailers ask for proof of ownership or a rental agreement to comply with safety regulations.

How much does a CO2 refill cost?

Prices range from $15 to $40 per refill depending on your tank size and the retailer. Welding supply shops are usually the cheapest at $15 to $25, while paintball shops and specialty retailers charge $20 to $40. Call local retailers to compare prices in your area.