The DirectVent Pro Wall Thimble provides a complete wall-pass-through and firestop and is designed for Square Horizontal Caps only. Refer to the appliance manufacturer's installation instructions for requirements
Unfortunately sometimes products do not work like they are supposed to. We offer a 6 month warranty on manufacturer defects. Some manufacturers make this a very simple and easy process unfortunately others do not. Please be advised that warranty claims for these parts may take up to 4 weeks for processing, and customers must cover shipping.