EAGLE™ I-Line 21FI-15I Female X Male NPT Adapter Size OD:4" What is the difference between

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EAGLE™ I-Line 21FI-15I Female X Male NPT Adapter Size OD:4" What is the difference betweenProcess line with Adapter Sanitary I Line Adapter (21FI 15I ) Available in 304 316L Stainless Steel 3A Certified for sanitary grade line process equipment I Line fittings provide a rigid, leak resistant seal, joining two separate tube fitting components. Available in both 304 Stainless Steel alloy, providing both strength and durability. This product is 3A certified for use inline process applications where sanitary conditions are a requirement.