Review on YOOTOP Plastic Aquarium Splitter Connector by Melissa Mcintosh

Suitable for air (aquarium) because air leakage is not that problematic. However, I've used this on a water circuit and they're all leaking for two reasons: the end cap wasn't glued (attached by taking them apart and gluing them in place) and the excess liner on the injectors is interfering with a lot of the hoses (I used silicone so it would be worse with PVC, fix it with a shave and a blowtorch). They ended up working for me, but it took too much effort to fix them. If you're using them for air and don't mind leaks, they're fine (and cheap). I wouldn't recommend it unless you need leaks.