How to safely use rubber pipette filler fill glass and plastic pipettes?

JCBIZ Lab Pipette Filler Bulb 3 Valves Rubber Pipets, Red Three Valve Safety Pipette Filler

BrandTech 30606 BLAUBRAND® Bulb Pipette, Glass, Class A, 4 mL; 6/PK

Pipette Bulb, 3 Valve Design, Up to 100 mL, Natural Rubber

Borosil Volumetric Pipette Bulb Class A ASTM 969 USP Type I 7.5 mL

Fisherbrand™ Safety Bulb Pipette Filler, Red

volumetric-pipettes,-class-a

LaboShop, Products

Safety Bulb - Pipette Filler Bulb

Bulb Pipette – Jaytec Glass

Agatige 10PCS Pipette Rubber Bulb, 6mm ID Dropper Rubber Caps Laboratory Suction Ball Graduated Tubes Droppers Pipettes Laboratory Tool Fit for 3ml 5ml 10ml 15ml 20ml Pipettes, Blue : Industrial