That is a 5026 Series air vent, our 502610A model. It does not have a manual method of venting the air. Make sure the cap is not screwed down tight; it is designed to be partially unscrewed to allow the air to escape. If it is, the vent hole is is probably clogged with debris and you should replace it.
Mindy,
That is a 5026 Series air vent, our 502610A model. It does not have a manual method of venting the air. Make sure the cap is not screwed down tight; it is designed to be partially unscrewed to allow the air to escape. If it is, the vent hole is is probably clogged with debris and you should replace it.