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Resources: The Greatest Invention - Class 150 vs 3000 Fittings - NPT Size Chart - Aluminum Info - Stainless Steel Info

| 304 SS | 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" |
| 2" | 2-1/2 | 3" | 4" | 5" NA | 6" |
| 316 SS | 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" |
| 2" | 2-1/2 | 3" | 4" | 5" NA | 6" NA |
Product information:
Schedule 10 Butt Weld Caps, referred to as Thin-Wall fittings, conform to ASTM A403 standards.
Schedule 40 Butt Weld Caps, referred to as Standard-Wall fittings, conform to ANSI B16.9 standards.