Yellow Jacket® Series 41 manifolds feature an easy-to-read 2-1/2 steel case gauges. Forged solid brass body for durability. Forged body includes full size metal valve handles for easy operation. Features Flutterless technology using a surge protector and silicone to dampen movement and minimize needle pulsation for easy, accurate readings. Full porting maximizes capacity. Hose anchors are forged into back of body at 45°. Sliding double O-ring pistons offer a non-rotating design that reduces wear. Only 1-1/2 turns give you full flow. Manifolds are pre-tested for reliability. Lifetime Limited Warranty.