SWISCO - The Replacement Hardware Authority

Do I have the 39-405

A home owner from Warren says:
I have a velux tps 6 skylight built around 1991. It's approximately 18" wide by 34" long. I measured my original operator, and it matches the 39-405 replacement operator. Would that be the correct operator for that model number? Also my original handle is held on with a set screw. Would i need to replace the handle?
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Tom from SWISCO responded:
I can't say for sure if the 39-405 is what you have. If it's Velux brand, and if the measurements are the same, then it seems like a good bet. I would recommend a new handle, yes. Some older Velux operators used a different kind of handle that is incompatible with the newer models.
A home owner from Warren says:
Am I going to need adaptor 39-550 to go with the operator and handle?
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Tom from SWISCO responded:
If you are ordering the 39-555 handle to go with the 39-405, then you will not need the adapter. The 39-555 already comes with one. You can actually see it in the product photos we have for the 39-555.
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