Our 4" Filter Media Cup Adapter is designed to fit our cups and allow our cups to be used in a broader spectrum of sumps. In other words. we didn't realize how popular these cups would become, and decided we needed to make an adapter ring that would allow our cups to better suit the needs of everyone, not just Red Sea owners.
Dimensions: 4 1/2in Diameter
Color: Sea Foam White
Material: 100% Virgin BPA free Polypropylene. Typically used in Tupperware. Material Certs. are available upon request.
Directions: Wipe cup with distilled vinegar, then slide adapter ring onto Filter Media Cup, then place your Filter Media Cup into your filter tray, and fill with desired filter media.