Sintered porous plastic plug for serological pipette

A method of making a filtered serological pipette comprising:

• providing a serological pipette with a lumen, and a first end and a second end, wherein the first end has a wider diameter than the second end;
• providing a rigid sintered porous plastic plug comprising a cylindrical body having a diameter equal to or less than the diameter of the lumen, a first end and a second end, wherein at least the first end or the second end has a cross sectional diameter less than the cross sectional diameter of the cylindrical body, wherein at least the first end or the second end comprises a tapered structure and has a cross sectional area at least 5% less than the cross sectional area of the cylindrical body;
• at least partially disposing the first end of the sintered porous plastic plug into the first end of the serological pipette;
• and,
• applying pressure to the second end of the sintered porous plastic plug to insert the sintered porous plastic plug into the lumen of the serological pipette such that the sintered porous plastic plug is located within the serological pipette and frictionally fit against the inner wall of the serological pipette.