Becker 300086 Ring,Sealing,Fiber,39 X 33.5 X 1.9mm thk for U4.70

Becker 300090 Ring,Sealing,Copper,13.16 X 10.4 X .8mm for U4.20

Becker 300092 Ring,Sealing,Viton,22.8 X 8 X 2.8mm thk for U4.20

Becker 310097 Seal,Dowty,18.5 x 11.8 x 1.5mm for U4.20

Becker 320232 O'ring,Viton,16x2.31mm for

Becker/ Busch/ Leybold 90220900000 Spider Coupling GR38

Compare

Becker 90657400000 Ring,Shaft Sealing for U4.165

Becker 91100200000 Ring,Star Tolerance for U3.6

Becker 91311690100 O'ring,Viton,14 x 3mm for U4.400

Becker 91311900000 O'ring,Buna,70 x 3.0mm for U4.70

Becker 91761100000 Ring,Sealing for U4.165

Becker 94803000000 Ring,Sealing,Copper,9.75 X 6.5 X .8 mm for U3.6