sippers for watering system

Does anyone know if they make sippers for an automatic watering system that are the "ball" kind and not the "pin" kind?

I have the Vari-Flow Valves, but would like to get valves that have the "ball point" style IF they make them.

I don't recall ever seeing any like that other then on water bottles. I don't think they would even work on an automatic watering system, Most automatic watering systems have at least a 5 gallon reservoir for water, there would be a lot more pressure behind that much water then there would be behind a quart bottle so I think that ball bearing tipped sippers would be very leaky with the extra pressure behind them.

A little late on this post but the ones on the water bottles can easily be pulled out but they will leak like no other when hooked to any type of hose with very much pressure at all