Specifications include, but are not limited to: THREADED BLACK NIPPLE PER THE FOLLOWING SPECIFICATIONS: 1. NIPPLE MUST BE CONSTRUCTED OF ONE OF THE FOLLOWING APPROVED TYPES OF MATERIALS: A-106, A-120, A53 TYPE EGRADE B, A53 TYPE S GRADE B, OR API-5L GRADE B STEEL. 2. BIDDER MUST SPECIFY TYPE OF MATERIAL. 3. THREADS SHALL CONFORM TO AMERICAN STANDARD B2.1. 4. SIZE: 3/4 INCH X 3 1/2 INCHES. THREADED BLACK NIPPLE PER THE FOLLOWING SPECIFICATIONS: 1. NIPPLE MUST BE CONSTRUCTED OF ONE OF THE FOLLOWING APPROVED TYPES OF MATERIALS: A-106, A-120, A53 TYPE E GRADE B, A53 TYPE S GRADE B, OR API-5L GRADE B STEEL. 2. BIDDER MUST SPECIFY TYPE OF MATERIAL. 3. THREADS SHALL CONFORM TO AMERICAN STANDARD B2.1. 4. SIZE: 3/4 INCH X 6 INCHES.