4" X 5-1/2" 304/304L Stainless Steel Pipe Nipple - Schedule 40 size_3" material: Black Malleable Iron connection:

material:   Black Malleable Iron connection:   Threaded Thread Type:   Female Features:   Meets or exceeds all applicable ASTM and ANSI standards   100% pressure tested before leaving the factory

In addition

1 Air Eliminators at the end of the long main or main running to the cold side of the building

1 Air Eliminators at the end of the short main or the main running to the warm side of the building

4" X 5-1/2" 304/304L Stainless Steel Pipe Nipple - Schedule 40 size_3" material: Black Malleable Iron connection:material: Stainless Steel connection: Threaded Thread Type: Male Features: Forged stainless steel material conforms to ASME A182 Forged stainless steel fitting dimensions conform to ASME B16. 11 NPT threads conform to ASME B1. 20. 1 Socket weld fittings conform to ASME B16. 11 Forged stainless union conform to MSS SP 83 Forged stainless outlets conform to MSS SP 97 Forged stainless socket weld Inserts conform to MSS SP 79 Manufacturing facility is ISO