1.big damper is for prevent your print head clogged, you should replace these dampers every six months

  These dampers work for water and solvent base inkjet printers.

2.There are 8 kinds of big damper:

1) big damper + big net + large filter 4mm*3mm

2) bigdamper +  big net +  small filter 3mm*2mm

3) big damper + small net + large filter 4mm*3mm

4) big amper +  small net +  small filter 3mm*2mm

5)big damper + double ink side (high speed ink line)

6) big damper + double spring (high speed)

7) big damper + suqare head

8) UV big dmaper + large filter

3.Suitable for the following models:
Mimaki JV3, JV4, JV22 .     
Roland FJ 540/740, SJ 540/740, SP 300/540.          
Mutoh RJ 900, ValueJet 1204, Falcon II Viper, Viper TX, RJ 8000/8100,
Rockhopper II, DraftstationSC 540/545, SJ 645/746EX