justin, if you look closely at the spring in the picture it looks like there is cap on the end of it, i suppose to seal the bottom channel and divert the hot water upwards.
Hi Justin
the pic may be a bit deceiving, at the end of the spring there is a stainless steel cup in order to block the flow to the next element horizontally, so the water has to go up to the top. When you fit them, the larger side of the spring is located to the radiator socket and will push the cup (diaphragm) against the second element.
Regards