The door only needs to be pushed by hand until the rubber roller enters the hook. The door damper does the rest and pulls it completely shut.
Door closing solutions references overview DICTATOR
Solution for slamming doors, Door damper V 1600
February 2, 2019: US Suspends its Obligations under INF Treaty
Door damper ensures securely closed cold storage room - Dictator
Door damper with speed control - EDH 14 - DICTATOR Technik - high
Cold Room Hydraulic Soft Close Door Closer Check Damper - China
DICTATOR Door damper - Functioning
Cold Room Hydraulic Soft Close Door Closer Check Damper - China
Door check VS 2000 with 35 N slows and closes doors with lack of space
Cold room
Door Closer Davenport Lift Control