When installed in the top of an enclosure, these fittings act as breathers which allows airflow through the enclosureBottom installations permit water from condensation to drain from the enclosure continuouslyFor use in enclosures with a maximum internal volume to 9526 cu-in or 160 liters
Hubbell KillarkĀ® KDB-1 Drain and Breather, 1/2 in NPT, 303 Stainless Steel