12" 150# = RING GASKET 1/8" THICK W/ 1/2" CENTER RIB This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. FLANGE RING GASKETS All Gaskets are 1/8" Thick Specifications 12" 150# = RING GASKET 1/8" THICK W/ 1/2" CENTER RIB How to Use Contact your Norchem rep for step-by-step instructions. Tweet