This adapter kit is needed if you’re wanting to put the Cyclone Feed on your 98 with Response Trigger. This will upgrade all the hoses and fittings on your gun from the smaller 1/16 Inch inner diameter to the larger 1/8 Inch inner diameter. It also includes the “T” fitting needed for guns with one exhaust port. While Tippmann Sports says this isn’t necessary for the RT system, it will give you better air flow through these hoses and fittings and is recommended by many players. The standard hose length in these kits fits the 98 series. (Including the 98 Custom Platinum Series) Also works with US Army Project Salvo. This kit also works with the A-5 for upgrading the fittings.