Personalized Hydraulic Engineer Plunger Youth T-Shirt. 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. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.