【Key Specifications】These 30" gas struts are hydraulic support components, with an extended length of 30 inches and a compressed length of 17 inches. They are capable of supporting lids weighing 200-280 LBS, providing smooth lifting and stable positioning for heavy covers 【Versatile Applications】These gas struts are trusted by DIY enthusiasts and professionals, and they are used for various heavy-duty lifting scenarios. They fit RV/camper bed storage lids, snowmobile trailer cover, basement door and trap door, floor hatch，making them ideal for custom DIY projects that require stable lifting support 【Easy-Install L-Type Design】This gas strut is equipped with a detachable 360° rotating L-type joint, and it is capable of flexible angle adjustment even in tight spaces. This design simplifies installation and avoids hassle with fixed mounting points for effortless alignment and mounting 【Durable & Low Maintenance】These gas struts are constructed with high-strength carbon steel and a double-layer oil-sealed piston, which minimizes maintenance needs. They are rigorously tested to 50,000 compression cycles, and they cause reliable performance and extended service life for long-term use 【Expert Support 】We offer customer support experts who are available anytime to help you select the right gas strut for your project. This product is backed by an 18-month product support., with dedicated after-sales support ensuring a totally worry-free shopping experience Can it be used on a boat hatch? Yes! The HUOPO gas struts are suitable for direct use on boat hatches. ideal for heavy-duty boat hatches. Featuring adjustable L-brackets and a ball-end design, it allows flexible positioning and fits perfectly on angled boat hatches. Key Notes for Marine Use: 1.Corrosion Protection: Constructed with carbon steel and pre-treated with anti-rust coating, the struts may still rust when exposed to saltwater for long periods. For permanent marine applications, an additional protective coating is recommended, or you can choose our stainless steel version instead. 2.Bracket Maintenance: The standard L-brackets work well under normal use. However, saltwater corrosion and hull vibration at sea can shorten their service life, so regular inspection and maintenance are advised. 3.Mounting Screws: Mounting screws are sold separately. Please select the appropriate screws based on your boat hatch material (wood/fiberglass/aluminum). Is it weather resistant This HUOPO gas strut is made of carbon steel with a QPQ surface treatment, delivering reliable anti-rust and corrosion resistance performance. For daily use, avoid prolonged exposure to humid environments; if used outdoors, proper shielding and protection are recommended to effectively extend the service life of the gas strut. Dose it come with mounting hardware? Included in the package: 2 gas struts, 4 adjustable L-shaped mounting brackets, 4 nuts and 1 installation manual. Mounting screws are not included and need to be purchased separately based on your actual mounting surface material (e.g., camper bed). Note: The included brackets may bend if the weight limit is exceeded. For heavy-duty installation applications, please ensure the bracket load capacity matches your requirements. If you have any questions, feel free to contact HUOPO customer service for assistance. What screws do I need? The specific screw size to use depends on your actual installation application: For wooden frames such as camper beds, you can choose 3/8" lag bolts (equivalent to M10 metric size), or alternatively 5/16" machine screws with washers (equivalent to M8 metric size) — a length of 1.5-2 inches is recommended for both. For metal mounting surfaces, 5/16" bolts with nuts (equivalent to M8 metric size) are required, and washers must be used to distribute the load. Based on feedback from most customers, 3/8" lag bolts are the best match for this gas strut. For heavy-duty installation applications, we recommend upgrading to steel bolts with washers to prevent bracket bending. Does it come with installation instructions? Every HUOPO gas strut comes with a detailed installation manual, and most customers report the installation is extremely easy. You only need to prepare the following basic tools: 1.Wrench or screwdriver: For tightening bolts and screws 2.Measuring tape: To accurately mark the mounting positions 3.Marker pen: To assist with precise positioning of mounting points 4.Level: To ensure the mounting surface is flat 5.Electric drill: For drilling additional holes if needed The entire installation process is simple and straightforward. If you encounter any problems during installation, HUOPO offers 24/7 online technical support. Please send your installation project details (including the length from the fixed end to the opening end of the cover, the cover weight, and the desired maximum opening angle) along with photos of your installation area to dhcustomerservice@outlook.com. Our engineers will provide a cus