I read that this product is made in China; however, and based on the question, I do not think the product is mad, as it is an object, a man-made utensil and has no feelings. Fair enough? question answered.

Garden Shop 1498 Heavy Duty Fireman's Nozzle, Garden Hose Nozzle, High Pressure Sprayer with Ergonomic Handle for Arthritis

Q: will thisvwork the same with a 5/8 hose or a 3/4 hose?

The fittings should be the same on 1/2 to 3/4 inch hose

Q: Does this have a warranty?

Yes. Every single GREEN MOUNT products enjoys 2 years return policy. If you have any questions, please contact our customer service. We will get back to you soon

Q: Is the handle all plastic or is it metal coated with plastic? Also, is the spray pattern 3 or variable? Thx

The handle is constructed of plastic material. However we built it with fresh material of ABS which is reinforced its strength and durability. It has passed the 1.2m drop test in our lab. Also the 3 spray patterns are range from CONE, JET to FULL which provide various uses for watering and cleaning. The spray patterns can be modified by simply twisting the nozzle head for many water patterns