Wye "Y" Strainers can be used in horizontal or vertical (downward) pipelines. A cylindrical perforated or mesh-lined screen within the strainer collects debris as the flow travels through the strainer. Cleaning Y-strainers normally requires the removal of the screen from the strainer, but a blow-off drain valve can be used to increase the time between cleanings.

Y-strainers include large straining capacities, precision machined seats, a standard blow-off drain connection furnished with a plug on low pressure
models, and many screen options. All cast iron and carbon steel units are epoxy painted to resist rust; all threaded and socket weld end connections have hex ends for easy installation. Many models have gauge taps as a standard feature. Y-strainers are available in ANSI classes up to 2500.