Was not sure it would fit my Craftsman Wet/Dry Vac, but it does so I'm not sure sure why they don't. RIDGID Wet/Dry Vac Hose to Drain Adapter and Cap.
RIDGID Wet/Dry Vac Hose to Drain Adapter and Cap: Amazon.com: Industrial. Craftsman ShopVac to drain using a garden hose and this RIDGID adapter does
Wet/Dry vac accessory, pumps out water at 10 gallons per minute and up to 40 feet. hose accepting shut-off valve, vacuum tank drain cap, two wet/dry vac tank
Craftsman Wet/Dry Vac Filter HEPA(00938753) – Ace Hardware · Craftsman Wet/
CRAFTSMAN WET/DRY VAC 16 gallon. 6.0 peak HP motor. Large 2-1/2" diameter hose. Drain port tank offers easy emptying of liquid messes. Vac quickly