Hi bro vratenza,
1. The undergravel filter tube is bigger in diameter than the input tube of Eden 501 filter that I'm using, so I basically insert the Eden input tube right into the undergravel filter tube.
2. It is a piece of acrylic. I bought a big piece from Art Friend, Bras Basah, and cut to my required size with a acrylic cutter... Penknife should be OK too...
Have fun!










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