I've had a dig about on the Spike site and the only other push-to-fit connectors I can see are the John Guest type connectors like these that marked as spares for the temp coil. Hope I've got the right thing, if not, can you post a photo of what you are looking for?
not a great picture but this is what they are using. In the 3 vessel video there are some good shots of these. and yes I've seen the ones on some of the pneumatic suppliers. they carry a hefty price of about 20 each.