Currently, Elkhart RV Parts does not stock 90° barbed bulkhead fittings with threaded screw-in installation in sizes from 1/4" to 2". However, we offer alternative components to achieve your installation goals. You can use straight barbed tank fittings combined with grommets or Uniseal-style seals to create a secure tank hole. For a screw-in style, source a threaded bulkhead adapter from a marine or hardware supplier to fit your grommet or seal. Then attach a separate 90° barbed elbow fitting to complete the assembly. This method allows you to customize your freshwater tank connections with reliable sealing and the desired 90° angle. Additionally, our Custom Fittings Install Service offers professional spin welding of parts into your tank if needed. We recommend using clamps to secure hoses to the barbed fittings for leak-free operation. If you have questions about specific materials or need assistance with compatible parts, our team is ready to help ensure a smooth RV freshwater tank installation.