Miller DuraHoist Confined Space 2-Piece Adjustable Upper Mast Traffic - Highway Signs and Stands Speech diaphragm is standard -

Speech diaphragm is standard - Amplifies workers' conversations

They are sold by the pack of 4 each

heavy-gauge aluminum

Handle is 3 piece snap together style providing 6' display heights (bottom of sign to ground)

A FDA approved high-density green polyethylene tank easily activated by pulling the yellow activation arm down to the open position

Miller DuraHoist Confined Space 2-Piece Adjustable Upper Mast Traffic - Highway Signs and Stands Speech diaphragm is standard -Compatible with any TWO Lower Mast Extensions, not exceeding a combined 90 inch in height. In other words, this upper mast, unlike the One Piece one, can be used with TWO lower masts as long as the total height of the two lower masts does not exceed 90 inches. Or to put another way, the combined height of the two lower masts cannot exceed 90" in height. For example, the 45" and the 57" lower mast can't be used together. Mast offset adjusts from 12