If you cant see your brand on the chart then just measure the length of the tank and pick the closest length of anode.
Camper water heater anode rod size.
There are only a few people that have a preference and it is normally based on aluminium being lower on the galvanic scale than magnesium so it produces less driving.
That means that it could outlast the actual tank.
I also think the atwood style heater certain vendors sold anodes with a pet cock in the end same purpose.
If no water you could continue to use it.
When choosing an anode rod for an rv water heater does aluminum or magnesium work better.
As mentioned above you might have a water heater with a separate inlet for the anode rod or your anode rod might be installed on the hot water outlet.
The purpose was you could pull the small plug in a maintenance session and if water came out you knew the anode was used up it reached the useful life.
Ozek rv water heater magnesium anode rod with ptfe tape compatible with suburban and mor flo water heater tanks 9 25 length npt threads 2 pack 4 8 out of 5 stars 844 9 99 oneness 369 2 pack water heater rv anode rod magnesium replacement suburban 232767 mor flo 3 4 thread with ptfe thread seal teflon tape.
There are two different anodes and the length is determined by model as coldiron stated.
If the anode is too long they can be simply cut to length with a hack saw.
Info needed to pick out replacement anode rod for rv water heater is there a torque spec for 3 4 camco anode rod what size socket is needed to install camco rv water heater anode rod cam11563.
As a rule you want the anode to be tip to toe running the full height or length of the tank.