Climax Part RC-037-4H @ 90 Mild Steel, Black Oxide Plating Rigid Coupling, 3/8 inch bore, 3/4 inch OD, 1 inch Length, 1/4-20 x 3/16 Set Screw auspowers_batchone 1/4" Max Bore Depth

1/4" Max Bore Depth

and the Diaphragm material is silicon rubber

Main Color: Gray

96043000701) YTH 20 B 42 T (96043002000

You can remove them or move them as you like

Climax Part RC-037-4H @ 90 Mild Steel, Black Oxide Plating Rigid Coupling, 3/8 inch bore, 3/4 inch OD, 1 inch Length, 1/4-20 x 3/16 Set Screw auspowers_batchone 1/4" Max Bore DepthClimax Part RC 037 4H @ 90 Mild Steel, Black Oxide Plating Rigid Coupling, 3 8 inch bore, 3 4 inch OD, 1 inch Length, 1 4 20 x 3 16 Set Screw Product Features Provides torque transmision and alignment Cost effective coupling design Easily installed where major disassembly would otherwise be required 4 set screws increase load capacity Black oxide provides some corrosion resistance