21.5mm pipe cap with vacuum hole suitable for Tank overflow cap
Description
This Part Fits Neatly Onto The Back Pipe Of An Aquarium Overflow. (Designed For Use With The Overflow Build Shown In... Https://Youtu.Be/Uzytenjztjw) It Has A Tiny Hole In The Top Which Forms A Vacuum To Help Prevent The Loss Of Pressure That Can Happen.
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