End cap, cap for ICANS1 diameter 40mm End caps mounted to the inside of the pipe, adjust by spreading the side plates. They are made of LDPE polyethylene in black, ash at another auction. These plugs are resistant to weather conditions, UV rays, frost-resistant. All applications in the furniture, interior design, machinery, electrical engineering and construction industries. PARAMETERS : R- avg. outer - 40 mm C - cap thickness - 5.0 mm H - depth - 15.0 mm E - minimum diameter - 32.0 mm F - maximum diameter - 38.8 mm What about the tank in winter? Just unhook the hose from the gutter and plug it with a plug as in the photos below.