You should replace your domes every 3 months or more often. If a dome is filled with earwax, replace it with a new one. If the hearing aids sound quieter, this might indicate that new domes are needed. 

How to change a tulip dome:

1. Remove the used dome by pulling it off the receiver and discard it. This may require a bit of force.

2. Push the largest petal back, then press the tulip dome over the ribbed end of the receiver.

3. Check that the tulip dome is securely mounted by verifying that the collar completely covers the ribbed end of the receiver.

4. Push the larger petal toward the receiver.
 

How to change an open or closed dome:
 

1. Remove the used dome by pulling it off the receiver and discard it. This may require a bit of force.

2. Push the new dome over the ribbed end of the receiver. 

3. Check that the dome is securely mounted by carefully lifting the lower part of the dome and verifying that the collar completely covers the ribbed end of the receiver.
 

4. When placed correctly, the dome will appear slightly angled.

Incorrect dome replacement can result in a dome being left in your ear when you remove your hearing aid.