Vishering visit hatch, white color. Visse visit hatch 150/205mm octagonal opening-- High UV-Resistance and Integrated EPDM-SEAL, Concealed Installation Frame, With Deep Receued Grips. The White 6 "Version Offers Additional An Octagonal Mounting For Raunning (MK100) To Open. The Coarse" Sawtooth "Thread Achieves Good Tightness and Risk of Thread of Thread Clamping.