Zook 4" rupture disk New rupture disks available the following pressures are available, Zook 4" 40 psi rupture disk #5695 Zook 4" 4.43 psi rupture disk #5450 Zook 4" 6 psi rupture disk #5456 Zook 4" 30 psi rupture disk #5697 Zook 4" 85 psi rupture disk #5452 Zook 4" 75 psi rupture disk small chip on rim of disk #7493 Please specify pressure when ordering, picture shown is 40 psi disk, please email for pictures of the other sizes. Shipping will be added to your bid. Click on tab for shipping estimate to your zip code. Terms Conditions: California Residents please add sales tax. Small items will normally be shipped USPS, larger items Fedex Smartpost or Fedex Ground, please check shipping tab, different options may be available We do ship some items internationally, please inquire. A Handling charge may be added for international shipments. All sales final with no warranties unless stated otherwise. Powered by Turbo Lister The free listing tool. List your items fast and easy and manage your active items.