Pipe Nipple 12" L X 3/8" MIP each X 3/8" D MIP Black Steel - STZ 308U38X12 STZ nipples are the way to go when selecting gas pipe for your residence. Our durable, schedule 40 black steel is hydrostatically tested. Not for use with potable drinking water Rated at maximum 203 psi at 400oF 100% tested at the factory Durable steel construction Use for above ground gas, LP and air applications Always check your local plumbing and gas codes before starting any piping projects Meets ASTM standards Not for underground use B K/Mueller boasts an extensive line of black and steel nipples. Galvanized items are coated for water applications and meet low lead requirements. End 1 Diameter: 3/8 in. Finish: Black Material: Steel Length: 12 in. Product Type: Nipple End 1 Type: MIP each End 2 Diameter: 3/8 in. Maximum Pressure: 203 psi Maximum Temperature: 400 F End 2 Type: MIP Brand Name: STZ Industries Average Lead Content: Lead-Free