Our 3/4"-16 O-ring to 1/8" NPT adapter with 1/8 NPT plug is perfect for adding a pressure gauge port on multiple applications. The adapter is made from black anodized aluminum and the 1/8 NPT plug is produced from stainless steel. Fitting Style: Adapter Fitting Category: AN to NPT Fitting Angle: Straight Fitting Material: Aluminum Fitting Color: Black anodized Fitting Size 1: -8 AN Fitting Size 2: 1/8 NPT