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What does the GSL suffix mean on the I-Line Busway plug-in unit part numbers?

What is the meaning of GSL suffix on an I-line Busway unit part number such as PBQ3660G-GSL?

Product Line:
I-Line Busway

Fusible Busway Plug In Units for I-line Busway

A= copper compression lugs
C = copper mechanical lugs (specify size)
GG = copper ground conductor
GS = gasketing on door & throat
L = special lugs (undefined)
M = automotive drip resistant
R = Class R fuse rejection clips installed
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