I donít think your missing anything, Iím in the process of installing one myself after have an impeller come apart on me on a passage
Of course it required disassembly of the heat exchanger to get all the impeller parts
, in an anchorage, with no access to any parts
and hadnít checked in with Immigration yet either, and Seatow wasnít an option. A concern was if a piece got through and plugged the one hole water flows though in the exhaust elbow
, Iíve heard of that, but thankfully it didnít happen to me.
The strainer I found is a lot larger though. I believe Iím going to hang it on the side of my heat exchanger ďYanmarĒ
Of course once the strainer is installed if an impeller ever comes apart again, Iíll just open the strainer and remove it, no disassembly of the heat ex required.