APPLICATION: 500 GALLON PROPANE TANK INTERNAL SPRING RELIEF VALVEKTHREAD: 1" MALE NPTRELIEF: 250PSI FREE SHIPPING IN THE 48 STATES Be sure to add me to your favorites list! Check out my other items!Sign up for PayPal; the fast, easy, and secure way to pay online. Feel free to ask us about conversion kits for almost anything including trucks, cars, generators, tractors, boats, motorcycles, RVs etc. We can build a kit to convert almost any engine! WARNING:This product can expose you to chemicals including Lead and lead compounds, which are knownto the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov. WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the state of California to cause cancer. www.P65Warnings.ca.gov. WARNING: These products contain a chemical known to the state of California to cause cancer and birth defects or reproductive harm. www.P65Warnings.ca.gov.