Product review (4 stars): All in all a fine device. In use about a year now
All in all a fine device. In use about a year now. Easy to clean, stops mice & cold air from coming down the dryer vent pipe.(had on once)
A gentle spring between lid and inside pipe cap serves as a cpunter balance to ease opening of the cap. If dryer air flow is weak one might wish to play with this balance a little.