The SLS the information is "Rust proof aluminum housing "
http://www.sunlightsupply.com/produc...s%3D%26pgi%3D1
At Premium Aquatics the information is "Housing is made of electrogalvanized steel"
http://www.premiumaquatics.com/Merch...ode=Sunpendant
Aluminum or steel ??? Rust proof or not ?