Bk 888-240 3/4 in Rubber Washer Dielectric Union

Product Description

The BK 888-240 is a replacement rubber washer designed for use in 3/4 inch dielectric unions. Made from Buna-N rubber, this washer provides a reliable seal within the union body, preventing galvanic corrosion between dissimilar metals in plumbing systems. It is a direct drop-in replacement for worn or damaged washers in standard dielectric union assemblies. Licensed plumbers and pipefitters install this component during routine maintenance or repair of domestic water supply lines, particularly where copper and galvanized steel piping are joined.

This washer fits 3/4 inch dielectric unions and is suitable for residential and light commercial plumbing applications. It is compatible with Mueller, BK, and other standard dielectric union brands that use the same washer geometry. The Buna-N rubber construction makes it appropriate for potable water service where a durable, compressible seal is required.

Key Features

• Buna-N rubber construction for durable compression sealing
• Sized for 3/4 inch dielectric union assemblies
• Direct replacement for worn or degraded union washers
• Compatible with Mueller, BK, and comparable union brands
• Sold individually — minimum order quantity of 5 units

Compatibility

Compatible with Mueller, BK, and other brand dielectric unions using a standard 3/4 inch rubber washer. Verify washer diameter and thickness against the existing union body before installation.

Installation Notes

Installation is performed by a licensed plumber. Shut off the water supply and depressurize the line before disassembling the union. Remove the old washer, seat the replacement washer into the union nut, and reassemble the union to the manufacturer's hand-tight-plus specification. Follow applicable IPC guidelines for potable water system repairs.

Technical Specifications

• Material: Buna-N Rubber
• Size: 3/4 inch
• Weight: 0.007 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 5
• UPC: 00032888882409

Standard Information

• Brand: BK
• Manufacturer Part Number: 888-240