This Volvo and Mack Diesel Particulate Filter Gasket is designed to fit most OEM and aftermarket filters with numbers 21371338, E30-0149, and ENV-G-VM. The gasket is made of wire knit woven graphite coned construction material and has a 15-inch outside diameter and 13 7/8-inch inside diameter. Sold individually, this gasket is a practical and reliable solution for maintaining your diesel particulate filter. Its durable construction ensures a secure fit and long-lasting performance, making it an excellent investment for any Volvo or Mack diesel vehicle owner.