The Pentair 152290 sand filter lateral measures 6 - 11/16" long and fits the Pentair Triton filter, Pentair Tagelus filter, and the Pentair Sand Dollar filter systems. Eight laterals are required for a full set and usually a good idea to replace them all at the same time to ensure longer life of your system. These laterals are removed and installed easily by simply threading (screw) them in and out.