Folks, for many years I have used the low price sprayers available at Harbor Freight around the home. The weak part in this sprayer is the O ring. Here's a link where you can purchase a replacement. Cheers, Ray
www.oringsandmore.com
Metric Buna O-rings 26 x 5mm Minimum 5 pcs
28mm ID x 38mm OD x 5mm CS-Price for 10 pcs
www.oringsandmore.com