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The heavy-duty 8900 Series non-handed surface applied closer
with adjustable spring power and backcheck positioning adjustment.
The 8900 has intensity adjustable hydraulic backcheck
that will take effect at approximately 65º. The 8900 has two
independent, noncritical adjustment valves to control sweep and
latch closing speeds. The backcheck positioning valve maintains
an effective backcheck range on parallel arm applications. The
8916 will be available with field adjustable spring power from size
1 to 6 for barrier-free requirements.

2-1/8" x 5" hole spacing

The Dorma 95059481 Lever Trim Return Spring is used on the 8000 series Lever Handles.   The spring has a 2-3/16" diameter.

The Dorma 8831 Top Arm for RTS88 is for use on Single and Double Acting doors.  This arm is known as a side load arm, and usually has a notch in the door at the top to access the arm fastening block.  This piece measures 10-1/2" long by 1-3/8" wide at the widest part, and is 1/2" thick.  This is the standard arm in the RST01 and RST02 Packages.

Dorma Part # 8831