Solberg 18P™ Paper Filter Cartridge with Prefilter for Compressor, 4-3/4" Height, 3" Inner Diameter, 4-3/8" Outer Diameter, 100 SCFM, Made in the USA

I had to purchase this filter for my Airaider well radon mitigation system. The original filter was over 5 years old so was coated in a layer of dust. The filter has a coarse pre-filter to help extend the life of the media. When I looked inside the 5 year old filter, it was clean. It’s well made and I didn’t notice any manufacturing defects.

Genuine replacement filter and pre-filter. Fits perfect. Good quality filter. I replaced the original filter on my AirRaider 433-S50X Water Radon bubbler.Will buy again next year!