Harris Model 2357-3 Nipple for Model 2290 Heating Tips - 9000738 Inside Cover Lenses What is the difference between

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Harris Model 2357-3 Nipple for Model 2290 Heating Tips - 9000738 Inside Cover Lenses What is the difference betweenHarris Model 2357 3 Nipple for Model 2290 Heating Tips 9000738 Model 2357 3 brass nipple for Models 2290 H and 2290 HPM heating tip assemblies. It has 1 2" 25 UNS 2A x 1 2" 25 UNS 3A connections. This nipple provides extended tip and tip tube life. Features Model 2357 3 nipple for Model 2290 heating tips Solid brass construction 1 2" 25 UNS 2A x 1 2" 25 UNS 3A connections Adaptor measures 1. 36" long x 0. 63" in diameter One year warranty 9000738