https://erybka.pl/product-pol-25462-Aqua-Medic-Przelot-przez-szklo-25-mm.html
It's a 25mm bulkhead with a proper pipe sealed with Teflon tape, plus an elbow with a drain strainer. The movable elbow allows you to regulate the water level.
It's a 25mm bulkhead with a proper pipe sealed with Teflon tape, plus an elbow with a drain strainer. The movable elbow allows you to regulate the water level.
