RaceFlux Dowty Bonded Sealing Washer, for 1/2" BSP & 21mm Threads

Seal a straight thread at the flange: this Dowty bonded sealing washer pairs a metal outer ring with a bonded rubber sealing lip, sealing under a fitting's flange as it tightens. Sized for 1/2" BSP and 21mm threads — the correct way to seal parallel threads that don't seal on the threads themselves.

Key Features

• Bonded metal ring with rubber sealing lip
• Fits 1/2" BSP and 21mm threads
• Cleaner and more reliable than thread sealant

Fitment & Compatibility

• Common uses: BSP-ported coolers, adapter fittings, drain plugs