Cavity Trays Type LTT Level Threshold Tray

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Type E; tinyurl.com/38...
Type G; tinyurl.com/2m...
Advantage Trays; tinyurl.com/22...
Type X; tinyurl.com/54...

[@handle1196]

Whats the green part that fits in the cavity? Can these be fit on a new build once the shell is up or do they bed under the mortar each side of the opening at dpc level