PolyformUS Inflation Adapter

I have a Polyform A-1 11X15 inch Buoy. i bought this adaptor to inflate it . Basically it doesn't fit. The screw thread fits in to the hose on the air pump but the fat end does not fit securely in the inflation hole on the Buoy. Therefore NO INFLATION! however the adaptor for my electric pump in the car works perfectly! Wish I'd have tried that first!

It works