SWISCO - The Replacement Hardware Authority

Window openers

A home owner from USA says:
The attached is the image I took of our unit. It seems that the length they refer to is that of the arms (not the width of the unit). it looks like there are two sizes of the window crank mechanism for your skylight

Is your 39-405 the unit that will replace the above pictured unit?

also should I also buy your 39-550?

please let me know Gerry
User submitted photos of a window operator.
Profile picture of Paul
Paul from SWISCO responded:
I agree, the 39-305 Velux operator looks like a very close match to your own Velux operator. You will also need the 39-550 if you're re-using your old hook handle. Otherwise, you should consider our 39-551.
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