homeburrero wrote:Looks like it's leaking where the plastic de-aeration valve (aka priming valve*) is threaded onto the plastic EP5 pump end. It may need tightening, or it may have been over tightened, damaging it, or may have a bad o-ring. Yours is a nylon threaded valve on a nylon threaded pump-end with a little #010 o-ring seal. A new o-ring or perhaps some teflon tape might fix it. Worst case would be a new pump and valve.
See the description of that valve here:
Pump? OPV? Check Valves? Wit's end!
Small leak from output end of Ulka pump
Edit addition: AKA air bleeder valve: https://www.espressocare.com/products/i ... ve-plastic
Thanks! Very helpful, appreciate the links. I've been drinking from a firehose learning about this machine the past 48 hours, so the assist on where to look is wonderful.