Replaces A-30, M-30
Navalloy aluminum anodes are manufactured to the military specification MIL-DTL 24779 and are suitable for use in all water types- salt, brackish or fresh.
Outside Hole Distance: 4-3/4" center-to-center
Hole Diameter: 1/4"
Weight: 1.0 lbs
Do your products meet Mil-Spec?
Yes! Sacrificial anodes must be impurity-free to properly work, and all our anodes are made only from Mil-Spec alloys. Our zinc anodes are also compliant to ASTM B418 Type 1. Our Aluminum anodes conform to Mil-Spec A-24779(SH)
How much zinc do I need on my boat?
First, the larger the surface area of an anode, the higher its electrical current capacity and galvanic holding voltage. For most boats, you want your anode surface area to be sufficient to maintain all underwater metals between -900 mV and -1100 mV relative to a silver/silver-chloride reference electrode.
Second, the longevity of a sacrificial anode is a function of its weight -- the greater the weight the longer its life.
Due to differences in water salinity, temperature, stray currents, and other external influences, you only know the right weight by actual trial. Periodically inspect your zincs, and when they have corroded to under 50% their original weight they should be replaced. To lengthen the replacement interval, increase the weight of zincs used.
We've designed hundreds of corrosion protection solutions for metal boats and underwater metal structures such as docks, boat lifts, and retaining walls.
USPS Ground Shipping!USPS Priority Mail packages are usually delivered within 2 to 3 days to any destination within in the United States, including the Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands. You may also specify a PO box or U.S. military address. The USPS delivers Monday through Saturday, and we email you the delivery confirmation we receive from them.
We Ship International!
For international shipments, we use USPS Priority Mail International Flat Rate Box service:
Click this USPS link for a list of countries we ship to: Index of Countries and Localities
UPS Ground Shipping!If you select UPS Ground as your carrier, you receive a Tracking Number that lets you monitor your shipment's progress at www.ups.com. Please note that UPS delivers Monday-Friday only and cannot deliver to PO boxes.
FedEx Ground ShippingWe offer FedEx Ground Shipping option upon request. Please contact us by filling a contact form or phone (754) 223-2297 before placing your order.
The Zinc Guy Local Shipping