I got my VEVOR Swimming 1/2 HP 110V Hot Tub 0.37 Kw Water Circulation Spa Pump today and had to check out the connections as a few have said the fittings are not standard US pipe size. My schedule 40 pipe fits perfectly into the pump fittings. Maybe they read some of the bad reviews and fixed the fitting size. I’ll power it up tomorrow and see if it will self prime. According to the directions that came with the pump it doesn’t look Iike it will self prime. I’ll update this after I check out how it operates. UPDATE: After connecting the plumbing this Vevor pump will not self prime. The only directions that come with this pump are for using it with a hot tub, spa, or something similar where the water level is above the pump so it is always primed. I’ll need to modify my in ground pool plumbing to use this pump with my newly purchased inverter heat pump pool heater.