Phoenix associates manufactures a variety of manway seals. Our standard seals are made out of .625" square Buna rubber that is 70 durometer hardness. We also offer Viton seals that are made from .625" square Viton rubber that is a 75 durometer hardness. We have the capability to make these seals in whatever size you need but if you reference the chart below the standard sizes are listed with their current pricing. If you would like more information or have a different size or material you would like please feel free to Contact Us and we would be glad to help.