Multiple Hollow Bulb Seal

A seal for use in a fenestration system, the seal comprising:

• a seal base;
• an elongated, resilient bulb member defining a longitudinal direction and a transverse direction;
• wherein:
• the stem portion of the seal base and the resilient bulb member are rigidly directly mechanically connected to each other;
• the bulb member includes an exterior bulb wall with an interior surface, and a first interior wall;
• the exterior bulb wall defines an interior space;
• the first interior wall separates and at least partially defines a first chamber and a second chamber within the interior space of the exterior bulb wall;
• the first interior wall comprises a first set of at least two internal support flaps connected to a first side of the first interior wall extending in the same direction away from the first side of the first interior wall into the first chamber;
• and
• the interior surface comprises a second set of at least two internal support flaps extending in the same direction away from the interior surface into the second chamber.