Used as flow-throughs in fish tanks, grow beds, and sump tanks. Made of food grade, food safe materials. Can be utilized with both media-based and floating-raft aquaponics applications. Commercial grade, with washers on the inside and outside.  Designed to prevent pesky leaks. Most common applications will utilize 1.5 inch to 3 inch bulkheads. 
 
SPECIFICATIONS:
• 1.5 inch opening
• 4.5 inches at widest
• 2.75 inch tall
• Threaded