These super-strong molded clam shells are an economical and attractive alternative for metal clam shells. These clam shells are great for routing cables or wires thru a hole or for covering thru hull openings to shield water spray.  They are also useful for covering small vent holes for ventilation.  These vents are UV and weather resistant. Available in two popular sizes.

Clam shell vent, Opening 9/16" H x 1 7/8" W, Base 2"x2"- Black
Sold in Pair