R.F. MacDonald Co. services and sells boilers, pumps, composites and accessories for commercial and industrial applications.

Mechanical Seals

Mechanical Seals


John Crane


Northern CA, Southern CA

• Dry Gas
• Elastomer Bellows
• Labyrinth
• Metal Bellows
• Non-contacting
• Non-Pusher-Elastomer
• O-Ring Pusher
• PTFE Bellows
• PTFE Wedge
• Slurry
• Split
• Vessel and Agitator

Flex-A-Seal


California, Nevada

• Split Cartridge
• Single Cartridge
• Welded Metal Bellows
• Dual Cartridge
• OEM Replacement Seals
• Heavy Duty Slurry
• Engineered Component Seals
• Mixer/Agitator Seals
• Gas Seal