I'm going to suggest an overhaul of the connectors.
If the male end of your hose is stamped brass, cut that sucker off and replace it with a good plastic fitting. The good ones have a flat surface on the edge that mates up with the washer. Look at the flat surfaces on the ends in the link below.
http://www.gilmour.com/Watering_Hose_En ... uplers.asp
If you want to use brass, be sure it is solid brass with a good flat end. You can file the ends of either brass or plastic to renew the surface. Of course the plastic will never need that, but the brass will eventually erode and need filing.
Next, throw away your flat washer and get some o-rings. There are many sizes of o-rings, get one that is the thickness of the flat washer or even thinner than that if they have it. You'll probably have to get help from the guy at a real hardware store, not the box store. They have trays of o-rings and can find one that fits perfectly. You can get o-rings on a plastic stem that are supposedly made for hoses but they're waaaaaay to fat. When they're too fat, you can only catch a couple threads on the fittings and that's asking for a different kind of trouble.
http://www.gilmour.com/Watering_Hose_En ... -Seals.asp
I'm pretty sure the ones pictured in the link above ARE TOO THICK. Get help from the guy in the store to get good thin ones.
Next get a good plastic shut-off valve. This gives you excellent control of the flow through the wand.
http://www.gilmour.com/Watering_Hose_En ... t-offs.asp
I use these and they don't leak. Actually they do leak until you put the pressure on, and then they seal up. Use an o-ring instead of the flat washer here, too.
If it still leaks after the repairs, then your female connector on the wand is leaking. You're in trouble with that. I'm not sure it can be replaced. You might be able to solder a female brass hose fitting on there. Ask at a plumbing supply place. I'm trying to imagine some PVC parts connecting there, but I'm drawing a creative blank.
I'm partial to Gilmour products. Still, I usually throw away that cheap plastic clamp and replace it with a steel hose clamp.
When you're replacing a female hose fitting, always screw a male connector in all the way to stiffen up that part to shove down into the hose. Otherwise the outer female part will want to break on you. And use a little Vasoline on the inside of the hose and on the fitting to make it go together easier. You could use liquid soap, too.