Veterinary plastic sheath plunger arrangement for artificial insemination. Utility patent for artificial insemination sheath plunger which is characterized by a plastic tube (1) with rounded tip (2) where the plunger tip (3) exceeds the surface level of the rounded tip (2) . It has larger housing (7) and smaller housing (5) for fixing 0.25cc vane (10) and 0.50cc vane (11) maintaining a perfect fit and sealing of the system when biological material is expelled. the guide angle (9) consists of directing the 0.50cc vane to the larger housing (7), while the angle (6) consists of guiding 0.25cc vane to the smaller housing (5) and to sealing vane sizes smaller than 0.50 cc and greater than 0.25cc. The piston body has a flap (8) which in contact with the inner wall of the pipe (1) provides perfect sealing of the assembly. the biological material vane fits into its larger housing (7) or smaller housing (5) by pushing the vane and plunger until the plunger tip (3) exceeds the level of the rounded tip (2). With conventional applicator the biological material is compressed and released through the plunger hole (4) directly to the point of application. the smaller housing (5) and larger housing (7) perfectly accommodate the vanes with a small angle and tightness, preventing loss of biological material by leakage or reflux at the time of application.disposição em êmbolo de bainha plástica de uso veterinário para inseminação artificial. patente de modelo de utilidade para êmbolo de bainha de uso veterinário para inseminação artificial que é caracterizada por um tubo plástico (1) com ponteira arredondada (2) onde a ponta do êmbolo (3) ultrapassa o nível da superfície da ponteira arredondada (2). possui alojamento maior (7) e alojamento menor (5) para fixação das palhetas 0.25cc (10) e palheta 0.50cc (11) mantendo um perfeito encaixe e vedação do sistema momento em que o material biológico é expelido. o ângulo guia (9) consiste em direcionar a palheta 0.50cc para o alojamento maior
