Type: Aquarium Filter Cup
Rimer & Rimer's 4" High-Flow Filter Media Cups will replace all those filter socks you have hanging around. Made out of a BPA free LDPE, this High-Flow Filter Media Cup has a flexible one-piece design that holds any filter media. The round design allows the Cup to slide into place, regardless of which "side" slides in first. The opaque color will easily hide any blemishes that may occur from changing out filter media.