3/8? Quick Connect Sample Valve Kit Fits most Ford Modular and GM LS engines. Aeromotive?s 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. Installs into any 1 /8? NPT gauge port. Provides a duplicate 1 /8? NPT port on the valve for installation of fuel pressure gauge or pressure sensor transducer. Sample port is equipped with stainless steel barb fitting for extension hose and rotates 360? for ease of installation and sampling. 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.