Sir you need to contact Bobcat on this or get a couple thread pitch gauges and a caliper. The hose assembly is custom made hose for Bobcat. If the hose manufacture was smart they would use metric fittings on both ends but they could used a NPT or SAE on the exit end. This why I have both Metric and SAE tap and die sets plus several additional taps and dies that were not included as some are optional sizes or I needed ones larger than sets had. At least I haven't needed any of the British taps and dies yet.
Kawasaki has their own drain valve assembly that the end user must supply a hose for. The main problem is accessing the valve which Bobcat probably made nearly impossible to get to. Here I just use a pneumatic oil extractor on most engines except on those engines that the dipstick tube is too small.