Arrangement in removable oil filters

PCT No. PCT/SE85/00252 Sec. 371 Date Feb. 14, 1986 Sec. 102(e) Date Feb. 14, 1986 PCT Filed Jun. 14, 1985 PCT Pub. No. WO86/00373 PCT Pub. Date Jan. 16, 1986.A removable filter container for use with a liquid system, and a method of removing the filter. A first container which houses the filter is removably attached to a main compartment of the liquid system. A second container which is normally empty is attached thereto. A manually operated punching tool connected to the second container punches a hole in the first container to cause liquid to flow from the first container through the punched hole and into the second container, lowering the level of liquid in the first container to prevent overflow of the liquid therein when removing the first container from the liquid system.