When ordering from the US, parcels may be subject to import tax and duty charges, which the buyer is responsible to pay. NEW LOT 2 Thermal Relief Valve Regulator Rupture Disk 8500 Psig 500F A4990-1 cc This product data sheet is originally written in English. Thermal Relief Valve Pressure Regulator Rupture Disk 8500 Psig @ 500F # 9812799 This is awesome. This is hard to find. SEE Condition above. I do not know anything about these. If you know something please let me know. I know these are hard to find and worth alot. It is 9.5 OAL. it screws on the bottom. PLEASE - Check out my other heater elements . I have lots and more to list. I will give you a deal on multiples. FREE SHIP Thermal Relief Valve Pressure Regulator Rupture Disk 8500 Psig @ 500F # 9812799 This is awesome. This is hard to find. SEE Condition above. I do not know anything about these. If you know something please let me know. I know these are hard to find and worth alot. It is 9.5 OAL. it screws on the bottom. PLEASE - Check out my other heater elements . I have lots and more to list. I will give you a deal on multiples. FREE SHIP Brand Watlow Model 9-1/2" oal MPN 9812799