most hoses and nozzles can be used I myself have never had a problem using any hose.
You should check the washer. Maybe it got cracked. Mine stays stuck in the spray position. It is guaranteed for 7 years!
Don't know. I assume off shore.
I THINK THE yellow stubs are to keep the water on so you don't have to keep squeezing but mine stopped working.
The ones I use the most are JET and SHOWER. THere's also MIST, CONE, FULL, SOAK, CENTER, FLAT
Yes, but I've had others that last longer than 3 months. You must be a Melnor rep.
I don't see why not.
The yellow band around the sprayer has all the adjustments - turn that and it changes the type/shape of spray you get.