Active Ventilation 12 in. D Green Aluminum Aura PVC Vent Cap Exhaust Static Roof Vent with Adapter for Sch. 40 or Sch. 80 PVC Pipe AV-12-PVC-GR - The Home Depot
Steinbach PVC Drain Valve 3/4" AG x NW 16 - pools.shop
Rigid air duct - PVC-SRGL - ALNOR Ventilation Systems - plastic / for ventilation / chemical-resistant