The Bykski G 1/4in. SLI/CF Expansion Joint is useful to bridge the gap between GPU blocks. The expansion joint can be used with any G 1/4in. threaded fitting components and can be adjusted between 41mm and 69mm. Features Diamond Knurled Specifications Thread: G 1/4in. Height (with thread):Varies Height (without thread):Varies Material: Brass Compatibility Loop: Non-Aluminum Included Parts 1x Bykski G1/4 SLI/CF Expansion Joint - 41mm-69mm Warnings Due to internal finish this part may not be compatible with DI water based coolants and is NOT compatible with PrimoChill Opaque and VUE Coolant Series! Not responsible for any damage caused by or when using this product. Use at your own risk.