Gasco & Scott Specialty Gases Cross-Reference — Manufacturer-Direct Calibration Gas | Trigas USA
Trigas USA uses the same part-number system as Gasco and Scott Specialty Gases. Because we manufacture and fill NIST-traceable calibration gas in-house, the Gasco part number you already use is also our part number — same gas, same concentration, same cylinder and fitting — at manufacturer-direct pricing, without the distributor markup.
Why buy direct from Trigas
Gasco cylinders are usually resold through distributors who add their own margin on top. Trigas fills the cylinder, so you skip the middleman. Same NIST-traceable certificate of analysis, Made in the USA, ships in 48 hours.
Popular Gasco / Scott part numbers
| Gasco / Scott part # | Composition | Trigas part # (same number) | Buy / sizes |
|---|---|---|---|
| 491 | 50 ppm CO, 25 ppm H₂S, 0.7% Pentane (50% LEL), 18% O₂, bal N₂ — 4-gas / quad | 34L-491 · 58L-491 | 34L · 58L |
| 489-S | 40 ppm CO, 20 ppm H₂S, 0.5% Methane (10% LEL), 18% O₂, bal N₂ — 4-gas | 34L-489S | 34L |
| 489 | 10 ppm H₂S, 0.5% Methane (10% LEL), 18% O₂, bal N₂ | 34L-489 | 34L |
| 489E | 25 ppm H₂S, 1.62% Methane (32% LEL), 18% O₂, bal N₂ | 58L-489E | 58L |
| 381 | 100 ppm CO, 1.05% Propane (50% LEL), balance Air — CO / combustible | 17L-381 · 34LS-381 · 103L-381 · 105L-381 | 17L · 34L · 103L · 105L |
| 248-75 | 75 ppm Isobutylene, balance Air — bump test / PID | 17L-248-75 | 17L |
| Thousands more | Any Gasco / Scott configuration | Same number, filled by Trigas | Search part # → |
Don’t see your part number?
We make 28,000+ configurations. Use our cross-reference search or email sales@trigas-usa.com with your Gasco or Scott part number for a same-day quote.
Shop disposable calibration gas →
Frequently asked questions
Are Trigas part numbers the same as Gasco?
Yes. Trigas uses the same industry part-number system, so a Gasco number such as 491, 489 or 248-75 identifies the same gas mixture when ordered from Trigas.
Is Trigas calibration gas NIST-traceable?
Yes. Every cylinder ships with a NIST-traceable certificate of analysis and is made in the USA.
Is it cheaper than buying Gasco through a distributor?
Typically yes. Because Trigas is the manufacturer, you buy direct and skip the distributor markup.
What is the shelf life?
It depends on the mixture: reactive 4-gas blends containing H₂S are 24 months; non-reactive CO / combustible mixes are up to 48 months. The exact shelf life is listed on each product page.
Gasco and Scott Specialty Gases are trademarks of their respective owners. Trigas USA is an independent manufacturer and is not affiliated with or endorsed by these companies. Part numbers are referenced solely to help customers identify equivalent products.