Comparison : Item # 77283-712, 12" Semi Flexible WR284 (R32) Waveguide Straight Section
Item # 77283-718, 18" Semi Flexible WR284 (R32) Waveguide Straight Section
Item # 77283-724, 24" Semi Flexible WR284 (R32) Waveguide Straight Section
Item # 79642-712, 12" Semi Flexible WR340 (R26) Waveguide Straight Section
Item # 79642-718, 18" Semi Flexible WR340 (R26) Waveguide Straight Section