Kevin
They are a gels in a plastic syringe, they do the same, so use one or the other. It can be used with the Catheter in and after the Catheter is out if required. What the nurses do is put the tip of the syringe down the eye of the penis at the side of the Catheter. Alternatively I would pull the penis back towards the body , squirt the gel on the Catheter and let the penis go back to its normal position. DO NOT try and pull the Catheter out and apply gel.
Apologies for the capitals.
Thanks Chris