Gauge - Fuel Pressure - 100PSIIncludes a solid brass adapter and release valve, steel housing (100 psi) gauge, stainless steel springs, Viton O rings, O ring lubricant and nylon storage pouch. Quickly diagnoses loss of power, poor fuel economy and hesitation and stalling. Releases fuel through drain line with the push of a button. Provides simple, fast and accurate fuel pressure checks. Made in the U. S. A..