Hello, I've seen this video - https://www.youtube.com/watch?v=pemiJHwf-oE on Youtube showing how to make a diy recovery pump. I would like to ask for your opinion based on your experience since I would like to make one for domestic (not professional or commercial) hobby use. if you have any remarks or suggestions, please let me know. Thanx. btw - for use with R134A refrigerant.