I've always used at least a short length of silicone tubing to connect the pump to rigid tubing to cut noise out if nothing else.
This would be easy to do if you wanted or needed to and would simply involve cutting the PVC you have then fitting a socket with a hose spigot on one end to your existing pipework - assuming you have the hose barbs for your pump that is.
This is exactly what I've got except the tube size is 25 OD and therefore the in-line reactors don't fit.
I am considering getting rid of the rigid PVC for normal aquarium tubing and then making a split using a reducer to 16/22 where I could fit the in-line atomizer. Would you say that this would be an improvement?