not to sure about Gerber being the best pressure flush, most all parts inside there tanks are made for them and others by Sloan, and Geber over time has some issues. When it comes to getting them to service there product. Briggs and American Standard are having some issues right now. American Std has been bought out and merged with Fiat and Crane, so there lines are going through some big changes. Kohler leads the industry in new designs and styles, along with customer service.