Reefmat 500 two connections with same size

[Frans1992]

Hello

I bought a reefmat 500 there are two connections for the hose Connector. The tube fits in both which one do I need to use. One is a bit longer but also wider in the top.

 

[CasperOe]

Use whichever one works well with your plumbing, there's no right or wrong here as long as water will pass freely (and there's no leaks!)