The Flame King Multi-Valve for 100LB Tanks is a must-have if you don’t want your tank to be transported every time you need it refilled! This allows you to do on-site refilling of your propane gas without disconnecting your appliances. It includes a service valve, a high-capacity filler valve with integral back-check, a pressure relief valve (375 PSIG), and a POL valve. Compatible with the Flame King 100LB tanks YSN100MLT-1 and YSN100. SAFE and SECURE – UL Listed