LF 3 a and LF 5a filter holders with Spin-lock closure. Can be operated with one hand. LF 3a is graduated to 300 ml and LF 5a to 500 ml. Supplied with lid kit for aseptic filtrations or with tubing from another flask. Fits bottles with GL45 thread. Made of polyesthersulfone (PES). Sturdy construction. Autoclavable. For 47 mm filters.