I purchased this pump head, brand new, after mine failed and I used it for about 5 days before changing the boiler. The pump head works perfectly, I only purchased it as a temporary fix until I got a new boiler. It comes with the original box and an automatic air purger (I never used this as I had no used for it). The part number is 7713520 and this part replaces part numbers: 7220533 & 7654033. It is compatible with various boilers, however, you will need to check this yourself to confirm compatibility as I cannot offer a refund if the part is not compatible with your boiler. Any questions, please don’t hesitate to ask.
