I was making a small research for restoring/maintaining my 10+ year old gaggia evolution.
On the website below it says ulka ep5gw is slightly stronger than ex5. (X for brass P for plastic)https://www.mrbean2cup.co.uk/general-ul ... 230v-ep5gw
Ulka website classifies ep5gw as special for gaggia coffee machines. And I saw on eBay also a model named ex5gw.
But ulka e5 range is widely used. Check the class of the pump and prefer f class of higher and don't buy a class. F class models have 2min on / 1 min off duty cycle whereas a class models have 1min on / 1 min off.
Other option is ars invensys pumps. My Evo lists it on the part diagram: "invensys cp3a 230/50".
I didn't make research on them but I read somewhere from someone who installed a dimmer circuit to keep the pump at lower power to decrease the pressure. He said his ulka e5 stopped working with dimmer anymore and the invensys pumps are better for the dimmer application.
I would like to hear of comparison between ulka and invensys.