30 Pcs Polycarbonate Greenhouse Panels U Connector Profile U Polycarbonate Profile U Channel U End Cap for Twin Wall Greenhouse Panels Prevent Dust, Rain, Fit 6mm or 4mm Panels, 2ft Length

Light weight and easy cut with razor knife

Arrived on time, exactly as described on line, cost was extremely competitive. The size matches the 2x4 polycarbonate panels that I will be using as the roof of my reclaimed wood window greenhouse.

I tested these on both 6 mm panels and 4 mm panels. They fit well and make a good tight seal on the 6 mm panels but are fairly loose on 4 mm panels. Should be used only on the upper ends of panels to allow for expansion and contraction and to keep moisture out which causes mold to form inside the panels. You do not want an air-tight seal.

Perfect. There were no issues with connectors being different sizes. They are strong and easy to install.

I recently built a small greenhouse, and used a twin-walled polycarbonate panel on one of the walls of the greenhouse. However, the large orange box store where I purchased the polycarbonate panels didn't sell hardly any of the requisite "accessories" for the panels. Namely, we're talking about THESE, which keep moisture and insects from getting in between the twin-walled construction of the panel. These work perfectly to help keep my polycarbonate panel looking and functioning as intended.