Source google image: http://french.pvcpipe-fittings.com/photo/pl18851153-sound_insulation_pvc_u_pipe_fittings_50mm_63mm_lightweight_pvc_union_joint.jpg
Isolation phonique 50mm
Source google image: http://french.pvcpipe-fittings.com/photo/pl18851153-sound_insulation_pvc_u_pipe_fittings_50mm_63mm_lightweight_pvc_union_joint.jpg