1 1/2IN 

Whale Smartbail Manual Bilge Pump #698-BP5012

• Ports are 1-1/2"
• This pump installs quickly and easily from one side of a bulkhead and is one complete assembly with no additional fittings required.
• The included foam seal eliminates the need for sealant and the compact size is ideal for limited spaces.
• Includes quick connect safe-release ports and an integral robust comfort-grip handle.
• Patented diaphragm design ensures easy pump action.