For the King Air B300 PT6A-60A:
Beechcraft Engine Wash Rings Kit 130-9003-xx (
xx being a number specific to your aircraft serial number)
Aircraft: B300(350), B300C(350C)
KIT NO. 130-9003-xx
An alternate solution is the Tronair (blue) removable flexible hose ring.
You may also need the Turbine Wash Tube PWC32271.
For King Air, most important is the
EXTENDED DRAIN KIT HBS/TPA 300EDM (one kit for both engines). This will avoid removing and re-installing the lower cowlings at every engine internal wash or rinse.
A good source is Kadex Aero Supplies in Canada.
