I have a coleman above ground pool #13381 and ithink i need an adapterto fit on my garden hose then into th drain valve

SOURCE: What is the size of the drain connector on a Danby DDR401 not a garden hose connector

Strange but true. I had tried to use a steel/brass connector from a garden hose. Although the same size as a normal garden hose connector when used with the nylon threads on the humitifier it simply would not tighten without coming off. I went to my local hardware store and tried plastic/nylon hose adapter to hose connector and it worked like a champ? Although it worked it to if overtightened (and not to much) would also want to fall off? it worked ok and everything is fine.....cheap engineering.

SOURCE: fitting a garden hose to an outside tap

i think you should ask it to the shopkeeper from where you buy it he can help you to fix it.

SOURCE: broken garden hose adaptor

We have the same pump and problems. I have attempted a few fixes with PVC sealant and hose clamps to the current adaptor, however the adapter is still continuing to crack. The adapter is removable- carefully so as to not damage the small eyelet it attaches to, (or in our case, it came off on it's own) and can be replaced by any adapter that fits- they can be found all over at lowes or home depot. I am personally going to try using a broken hose and clamping it directly to the eyelet. This is not a good reason to buy a new pump- they fix too easy!

SOURCE: air in filter on hayward above ground pool.

This is common the first 30-60 seconds after turning the filter on. The filter is purging its self of the air, sometimes algae or small debris will shoot back into the pool as well.

If it is constantly getting air then replace your o-ring on the that clear cover (Strainer Cover) make sure you use a lubricant, and like djtc66 said re-wrap all threaded areas with teflon tape.

SOURCE: Whirlpool AD50USS Dehumidifier WILL NOT DRAIN THROUGH HOSE

I have a similar model. There are two drains, one for the hose and one directly into the bucket. The hose one is supposed to be lower, but I had to put a 3/8 inch block under the right side of the unit to get the water to favor the hose instead of the bucket. Another possibility is that the far end of the hose is higher than the near end. If you can't lower it, you can put the whole dehumidifier up on blocks. One other thing to check is that the hose has a rubber washer in it where it connects to the unit. Use a tissue to see if this connection is dry. If it leaks, it will just drip into the bucket.
Good luck!