This is the case with [Penguin DIY]’s tiny centrifugal water pump built from 5 ml syringes ... The tiny impeller is a section of the syringe’s original plunger, with its cross-shaped body ...

Ped/Adolescent 5mcg/0.5mL: single-dose vials (yellow cap), single-dose prefilled syringes (yellow plunger rod)—10 ... regimen): give 1st dose of 5 mcg (0.5 mL each) at elected date and repeat ...