Personalized Hydraulic Engineer Plunger Toddler Full Zip Hooded Jacket. Hydraulic engineer text with an image of a toilet plunger is a humorous gift design for hydraulic engineers, college students, plumbers and home handymen and women at birthdays and holidays. 7.5 oz., 60/40 cotton/polyester. Jersey-lined double-needle hemmed hood. Pouch pockets for all their treasures. Coverstitched shoulders and armholes. Coverstitched rib waistband and cuffs.