STZ nipples are the way to go when selecting gas pipe for your residence. Our durable, schedule 40 black steel is hydrostatically tested. Pipe, fittings and nipples are available in an array of sizes to fit residential and light commercial gas, LP and air applications.; ; Brand Name: STZ Industries End 1 Diameter: 2-1/2 in. End 1 Type: MIP each End 2 Diameter: 2-1/2 in. End 2 Type: MIP in. Finish: Black Material: Steel Length: 10 in. Product Type: Nipple Average Lead Content: Lead-Free Maximum Pressure: 230 psi Maximum Temperature: 400 °F Packaging Type: Bagged