About compress in pg_dump

To backup  a database  I do:

 nice -n +19  pg_dump -Fc  database | nice -n +19 gzip --rsyncable   -nc >  database.dump

If -Fc  option  is compressed  by default  I dont need gzip the backup,  but I need pass --rsyncable  and -n options.

How can  I pass  gzip options  to compress in pg_dump?

if not   I will use : 

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