4YourHome Blue Star Foam Filter Designed to Fit Electrolux Central Vacuum CV3271B, CV3219, CV3291C, CV3391A, CV3391D 4YourHome Blue Star Foam Filter Designed to Fit Electrolux Central Vacuum CV3271B, CV3219, CV3291C, CV3391A, CV3391D Fits the following models - CV3271B, CV3219, CV3291C, CV3391A, CV3391D Color - Blue Should be cleaned or replaced every 30 days Please note this part is a non genuine compatible spare part and the manufacturers names and part numbers have been used for reference purposes only