Grey PVC vent with insect screen. Extended 4 inch BSP threaded shaft, to accommdate up to 80mm of insulation, fitted with two PVC nuts, one with a conformable foam washer. Grey PVC cowl over screen.

Norscreen VP400-090M

Screened Cowl Vent with 4 inch BSP thread for cisterns with walls and insulation up to 90mm thick