AN-4 (4AN 7/16" UNF) Dowty Washer / Bonded Seal x 2. AN-4 (7/16" UNF) Dowty Washer / Bonded Seal x 2. Self centring bonded seals to suit AN-4 (7/16" UNF) threads. Manufactured from mild steel and Nitrile rubber.
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