Review on Connect Fittings Pneumatic Spliters Straight by Tim Larsen

I really like the simplicity and quality of this product. If they are leaking, the hose is probably not fully inserted. As you insert the hose into the connector, you must push it past the second point of resistance. I think the first thing you might confuse is the pins that keep the hose from flying out of the connector. The second pressure point you press is the actual o-ring. You have to push hard, but you'll know when he's fully in. If you are unsure, disconnect the hose from the connector and try again. If you're having leaks, it's probably because the pins are snapped in to hold the end of the hose to the o-ring, but the hose isn't fully seated in the o-ring. I have several connectors where the hose is kind of tilted into the connector. because the hose is pulled from a strange direction, but not a single leak.