The Vetus Siphone Break:
The Groco Version:
And the Forespar Version:
They all perform the same function although the Vetus and Forespare versions are easiest to fit with a vent line led above the water
Why did you have to change your water
pump? And, is your sea-water strainer above or below the waterline and are your sure the seal hasn't been compromised on that? If its one of the plastic versions such as:
and it's installed so that you can clear it without shutting the through hull
(i.e. above the water line) you may have a leak in the cover seal.