Personalized Funny Hydraulic Engineer Youth Long Sleeve T-Shirt. Funny Hydraulic Engineer Youth Long Sleeve T-Shirt - White say "Flow Rate Beer Hydraulic Engineer" in black text and makes a fun gift design for ale loving engineers! youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)