what is fusible link

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The Fusible Link arm is available with the 4010, 4020 and 4110 series closers. They all use the same Fusible Link arm. The UL Listing number is for the Fusible Link arms is R1943. The 4010 Serie...
FL, hold open arm
Fusible Link Arm, Fusible Link
Air Conditioning, Pierced, Inserted, Fusible Link
Offset link for 98/9947WDC is not available by itself. You need to purchase the 98/9947WDC conversion kit, 050134.
A and AL product: Must use the 2 3/8" backset with the 41-005 extension linkD Knob and ND product: Must use the 2 3/4" backset with the 43-005 extension link