...depends on whether you have a T-20 machine or the suprema, etc (cannot read the model in your pix)...if you have a T-20, tell them you want the $3.99 one...if you have any other (bosch unit) tell them you want the $9.99 one...i had to replace mine a couple times (3rd unit!), and can probably tell you why...if you make hot water for tea alot w/ the yellow/gray 'placebo' cleaning disc, the plastic is sharp right around the outlet nipple (that contacts/seals onto the piecing unit once closed) & smashes/tears the rubber over time & consistent use...believe or no...i carefully took some 1000 wet/dry paper & went 'round it many times to soften the edge (not the easiest task!)...haven't replaced it since, 9 mos running strong! :P ...

jus' looked @ your other pix! u have the same machine as mine, Suprema!... tell them u want the silver suprema piercing unit $9.99 (the other is black and the same price, but color is irrelevant!)