Vico Marine Boat Vent II & III – Boat Cover Vent, Black (Stops Mildew & Pooling)

A covered pontoon without ventilation is a mildew farm — trapped humidity condenses under the cover all night and rains back onto your upholstery. The Vico Boat Vent solves it for under twenty bucks: it props the cover into a peak so water can't pool, and its louvered design keeps air moving underneath so moisture leaves instead of soaking in.

Installation is tool-free: the vent clamps through any support-pole grommet or plain cover section. Boat Vent II is the classic double-stack design; Boat Vent III is the newer low-profile version with improved grip.

Sold individually — one vent per ~10 ft of cover is the usual rule, so most pontoons want two.