DN 20-25 KF, Aluminum Clamping Rings - Lot of 8

Used but in good condition. 
4 of these are marked with " DN 20-25 KF " but the other 4 are unmarked.  
I don't know what size of pipe these are for but it looks to me like they would work with a pipe with with an OD of about 1-1/4" with a flange with an OD of about 1-3/4".  I don't know for sure though what size of pipe these are for.


S365-33
fdk 80626238