A “Bulk Head” is a plumbing fitting designed to pass a connection through the sealed wall. These fittings are often used to gain fluid access to aquariums and filtration units. There are many different styles, types, and sizes that can be used depending on application. Scroll down to view the different varieties.

PVC (Schedule 40) 

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FS (Female ​Slip ). 

Aqua-Link Acrylic Design Products 
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Flanged Bulk Heads.

FPT (Female Pipe Thread). 

PVC (Schedule 80) 

Bulk Heads.

ABS Plastic