GP2170-05 SystemPod Pre-Cut for Raymarine es127/es128 & 2 Instruments for 12" Wide GuardInstrument Cut Out Size:3.6" HoleNavPod GP2170 Series for 12" Guard, SystemPods are for mounting multiple pieces of electronics in one NavPod. This is a good way to reduce the height of a system. In addition to mounting a radar or chartplotter, you can have room for an autopilot, instrument, stereo controller, or VHF mic.A SystemPod is best mounted on a Single Bend AngleGuards. The single bend AngleGuard for this model is the AG218.The Hi-Gloss MaterialNavPods are manufactured with a custom co-extruded acrylic capped ABS material. We use the absolute best UV resistant material that provides avery high gloss white finish that matches gel-coated fiberglass. The Gen3 enhancements now include a thicker gauge material that improves strength andprovides for better structural rigidity.The Waterproof SealAll NavPods are manufactured with a double gasket system providing an excellent watertight seal between the front and back of the NavPod for protection of your Marine Electronics. NavPods are made to withstand the harshest of wet offshore boating conditions. Gen3 enhancements include a thicker external silicone gasket with improved flush fit. The internal EPDM gasket is now 50% thicker and is not subject to "compression set" like many rubber compounds. This is important when you need to open the NavPod in the future to service your electronics.The Nickel Chrome Plated ScrewsWe use all stainless steel mounting hardware that is supplied with each NavPod. Large round head tamperproof screws have deeper sockets for theNavPod wrench for better holding ability when tightening than the previous screws. For Gen3 we provide nickel chrome-plated stainless steel tamperproofscrews for security combined with a little bling!The Manufacturing ProcessHeavy-gauge thermoforming is considered an art since many processes come into play. It all starts with the design and development of the tooling. We are fortunate to have experienced in-house design engineers who utilize CAD programs like Solidworks, Catia and AutoCad. Surfcam is used to precision tolerances. Our Commitment to QualityWe are committed to producing the best possible waterproof housing for Marine Electronics. Now with two decades of experience under our belt, we are confident you will have years of trouble free service and a long lasting high gloss finish. We will stand behind our commitment by now offering a 10-year warranty on all new Gen3 NavPods.