|
Protect your propellor with a zinc anode. The sacrificial anode is eaten up by electrolysis more easily than the zinc in the bronze alloy of your propellor, thereby saving the expensive propellor with an inexpensive anode. Most Alberg 30s seem to have a 7/8" shaft, though I've heard of some with a 1" shaft. Get the size that fits your boat. A 7/8" shaft has 5/8-11 threads on the end, and a 1" shaft has 3/4-10 threads.
Note: As of June 2025, I don't know if ElectroGuard is still in business. Their website now hosts a Hong Kong online betting site. BoatZincs.com offers some prop nuts and zincs that look similer to the ElectroGuard units. Sea Shield Marine also has zincs (but apparently not replacement prop nuts) that look similar.
|
|
Camp acorn zinc and prop nut. The zinc is internally threaded and
screws onto the prop nut, which has a thread to receive it. You may have to cut off the tip
of the zinc to clear the rudder. I also cut down the nut, itself, to reduce the amount of
zinc that had to be removed for clearance. 
The replacement anode is part #ZPC-1. This anode has 3/4-10 threads and fits both the 7/8" and 1" Camp prop nuts. These prop nuts appear to be discontinued, though Camp still offers the zincs.
ElectroGuard prop nut and zinc is held on with a cap screw. Unfortunately, replacement zincs
do not come with a new cap screw, so you need to order that separately. Bronze cap screws
can be hard to locate.
For a 7/8" shaft, use part # PN-2004-R for the entire unit and PN-B for the replacement anode.
For a 1" shaft, use part # PN-2006-R for the entire unit and PN-C for the replacement anode.
Canada Metal (Pacific) Ltd. makes a similar nut and zinc which it sells under the brand 
Another kind of propnut and zinc. I don't know what manufacturer this is.
Standard "donut" zinc to fit around the shaft, if you
have enough space. This would go between the prop and the stuffing box.
