It can be a bit daunting to know where to start with measuring tap cartridges, so start with these 3 measurements:
This is Measurement J in the checkboxes below
This is Measurement A in the checkboxes below
This is Spline Count in the checkbox below
Once you have narrowed down your search using the filters*, you can take other measurements to try to pinpoint the right cartridge. See our How to Measure page for further help. *Please remember the filters will narrow your search, but do not guarantee an exact match as some leeway is built into the filters where possible to give extra options where we think this is appropriate. This also takes into account how tricky these can be to measure, so ensure you check the sizes we show on each individual product to find the best match. If after doing this you cannot locate your correct cartridge, then please feel free to send us a photo and your measurements using the Send a Photo instructions. The sizes shown on the individual product pages have a +/- 0.5mm tolerance. The filters have varying tolernaces built in as and where we feel it allows.
