ZB0620-20 Marine Hardware parts & accessories Boat Plastic Thru Hull Fitting Bilge Pump Drain or Vent Hose Fitting Connector for hose Description: Our Thru-Hulls are meant for installation through the transom and are ideal for overflow use in live well installations or as an exhaust port for a bilge pump. These thru-hulls are available in a variety of sizes ranging from 5/8â?³ up to 2â?³. Their construction is designed to resist degradation as a result of chemical and saltwater exposure. *Sturdy construction for long lifespan *Easy to install and remove *Simple to use