Parker 11R20 String-wound Filter 50 Micron 20 Inch Cotton

Product Description

The PARKER 11R20 is a string-wound cartridge filter designed for plumbing and water filtration applications. It measures 20 inches in length with a 2.5-inch outside diameter and delivers 50-micron filtration using a cotton winding over a tinned steel core. The cotton construction makes it well suited for sediment removal in potable water, process water, and general-purpose liquid filtration lines. Licensed plumbers and water treatment technicians are the typical installers. The tinned steel core provides structural integrity under pressure, and the unit is rated for service up to 250 degrees F, making it compatible with both cold and moderately hot water systems.

This filter cartridge fits standard 20-inch big-blue or standard housing configurations used in residential and light commercial water treatment systems. Common applications include whole-house sediment pre-filtration, irrigation supply lines, and point-of-entry water systems where coarse particulate removal at 50 microns is the target. It is also used upstream of finer-rated filters to extend service life on downstream elements.

Key Features

• 50-micron cotton string-wound media for effective sediment and particulate capture
• Tinned steel core resists corrosion and maintains form under flow pressure
• Rated to 250 degrees F for use in higher-temperature water lines
• 20-inch length fits standard big-blue and comparable 20-inch filter housings
• 2.5-inch outside diameter for correct seating in compatible filter sumps

Compatibility

Designed as an OEM-style replacement cartridge for standard 20-inch string-wound filter housings used in residential and light commercial plumbing filtration systems.

Installation Notes

Installation is performed by a licensed plumber or qualified water treatment technician. Shut off the water supply and relieve system pressure completely before opening the filter housing. Inspect the housing O-ring for wear and replace if needed before seating the new cartridge. Follow local plumbing codes, including applicable IPC requirements, for filter installation in potable water systems.