I couldn't replace the cover.

A home owner from Seoul, Korea says:
June 22, 2020
Hello. I bought 39-239B recently and changed it, but I couldn't change the existing cover. I think it's 39-451 but do I need to buy 39-563?
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Tom from SWISCO responded:
June 25, 2020

Hello! Yes, the 39-451 cover/handle are what we use with the 39-239B. As for whether the gasket is necessary, that depends. It isn't always. I would say that if your old operator used one then you will need a new one as well.
Encore Truth Operator Cover and Handle
Encore Truth Operator Cover and Handle
39-451
$12.05
Encore Operator Gasket
Encore Operator Gasket
39-563
$1.25
Encore Awning Operator, Sill Mount
Encore Awning Operator, Sill Mount
39-239B
$42.42
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