That is called split a well seal.
If it actually sealed, and there were no vent, drawing water would produce a vacuum. Best is to put a vent with a screen/slots that exclude insects. You could unscrew that to add bleach, vinegar, and to recirculate water during sanitizing, just as you could unscrew a 1/2 inch plug.
They don't seem to be carried as widely as well seals are, so they might not be so common, or needed.
https://boshart.com/product/pvc-air-vent/ The PVC air vent is Boshart
WS-V05 and their galvanized unit is part
https://www.supplyhouse.com/Boshart-WS-V05-1-2-MPT-Black-PVC-Well-Seal https://www.ferguson.com/product/simmons-manufacturing-12-in-mip-pvc-well-seal-vent-si750/_/R-66765
The SupplyHouse listing has errors I think , because this item is not a seal, and part WS-V05 is the PVC version. Picture matches. The galvanized Simmons vent is part WS-V05-G, and it costs more.
https://www.ferguson.com/product/campbell-manufacturing-12-in-pvc-plastic-well-seal-cwsv/_/R-1003992 is another vent. They each have 1/2 MIP threads.
If it actually sealed, and there were no vent, drawing water would produce a vacuum. Best is to put a vent with a screen/slots that exclude insects. You could unscrew that to add bleach, vinegar, and to recirculate water during sanitizing, just as you could unscrew a 1/2 inch plug.
They don't seem to be carried as widely as well seals are, so they might not be so common, or needed.
https://boshart.com/product/pvc-air-vent/ The PVC air vent is Boshart
WS-V05 and their galvanized unit is part
https://www.supplyhouse.com/Boshart-WS-V05-1-2-MPT-Black-PVC-Well-Seal https://www.ferguson.com/product/simmons-manufacturing-12-in-mip-pvc-well-seal-vent-si750/_/R-66765
The SupplyHouse listing has errors I think , because this item is not a seal, and part WS-V05 is the PVC version. Picture matches. The galvanized Simmons vent is part WS-V05-G, and it costs more.
https://www.ferguson.com/product/campbell-manufacturing-12-in-pvc-plastic-well-seal-cwsv/_/R-1003992 is another vent. They each have 1/2 MIP threads.
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