A zinc collar anode for Isotherm boilers, original part number SBE00006AA-39051 or 39051. The zinc anode is made in Italy to an extremely high specification (US MIL Spec), with the entire melting and casting process performed to ISO 9001 standards.

Every heating and cooling anode sold by Anode Outlet is genuine and manufactured to the highest quality anode specification. Item(s) shown in image may not come in manufacturers' branded packaging due to production processes.

Fits the following:

Isotherm 3251 ASU SP.
3751 ASU SP.
Isotherm 4200/5200/5700.

The boiler anode also fits Isotherm SP Fridge on the outside of the brass skin fitting.

Specifications:

Please refer to the diagram in the product images.
h: 10mm.
i: 42mm.
Ø: 101mm.
Ø1: 52mm.
Ø2: 5mm.
Weight: 0.24kg.

Useful Links:

Blog: How often should a sacrificial anode be replaced on a boat?
Blog: Cathodic protection for boats.
Blog: Aluminium versus zinc anodes.