Carvin SERIE'S FEATURES7-way dial valve with "sight glass" automatic air relief, and pressure gauge. The 7 functions are :Bottom drain for winterizing and draining.LASER/CFR25 combination give us the best of two worlds. The large filtration capacity of a sand filter with the finess of a cartridge filter.The CFR25 is manufactured with a by-pass valve that will open if the flow rate goes over 30GPM (72.9m3/h).Shipped in two boxes for easy storage.Ring-Lok access to filt