This filter will fit many common coffee syphons. The spring could be stretched to fit the large capacity syphon. It comes with one filter cloth.

It is handy to have a spare filter like this so you can make consecutive syphon brews without having to clean the original filter. This filter can also be used in older syphons that had glass filter rods - the cloth filter makes stirring the grinds easier, is unbreakable, and you can use a finer grind of coffee.