Aeromotive's 15631 Billet Fuel Sample Valve is designed to simplify installation and make fuel checks a snap! Packed with common sense features, it's simply the best sample valve on the market. The "dual action" spring loaded safety valve keeps the valve sealed when unlocked and rotates into a locked position for racing. When a fuel sample is required, rotate to the unlocked position, press for fuel sample and release, re-lock the valve and go race! The sample port is equipped with a stainless steel barb fitting for extension hose and rotates 360° for ease of installation and sampling. Best of all, this fuel sample valve provides a duplicate 1/8" NPT port for installation of a fuel pressure gauge or pressure sensor transducer.