Anti-perch systems prevent birds from sitting on the drinking line. Used for rearing, layers, parent stock and free range birds and in systems with stabilization tubing. There is a choice of two types: Electric shock controller with anti-perch wire and double anti-perch wire system. - Order for electric shock system: 1 mounting set per drinking line - Order for double anti-perch wire system: 2 mounting sets per drinking line Electric shock controller with anti-perch wire