I bought the Wagner Control Stainer 150 on Monday. I first used it on Thursday. While cleaning the sprayer, I lost the check valve. I thought I was done using it. I emailed Wagner, who recommended this site for the part. Wonderful! I went on the site and ordered the kit. In addition I ordered some other parts for the sprayer and downloaded the Wagner manual that had a parts breakdown. I placed the order on Friday and got the part on Monday (from Minnesota to Florida) even better than wonderful. Thanks