Product review (5 stars): This Customer Appreciates The Sevice and the Quality of Their Products!
I have an old Emerson 'Humidair' humidifier with two 4.5 gallon water tanks and filter design wicks for the water, plus 2 large fans built in to it. One of the caps broke and the other got a crack in it. I repaired them but knew they would not last much longer. They were some 25 years old or more. So I ordered 4 of these caps to have 2 for spares. Essick sells the filters also so I can use them as a one stop shop and get it store. The prices are reasonable and the quality is very good indeed. I am happy with the purchase and the  great service and caring in the shipping of these parts, etc. to me. If a problem develops, simply e-mail them and they will resolve the issue right away. That is a good sign of a company that truly cares about its customers and offer quality products.