Kendrick ZapCap 20mm Heated DewCap for Intes Alter 603, Fits ODs 195 to 210mm

Kendrick ZapCap 20mm Heated DewCap to Fit Tube ODs of 195 to 210 mm is constructed of the black ABS plastic with felt lining and is attached by wrapping it around your telescope just below the lens or corrector plate ring. The two outside ends are then pressed together using the sewn on Velcro. The ZapCap Heated DewCap have a built in low wattage heater that makes good contact with your telescope to keep it free of moisture. The heater is inside a rubberized sleeve and it is this sleeve that provides a friction fit and keeps the ZapCap in place.