Are the 3/4 in male threads compatible with a normal garden hose?

The 3/4 is an NPT thread. I believe that the garden hos is brass pipe thread.

Is the female thread fine like what you would use for a shower hose hookup?

The National Pipe Thread (NPT) is a U.S. standard size for a brass or stainless steel fitting that connects rigid pipes such as shower heads and the shower arm protruding from the wall. If you're replacing a shower head, you'll find the parts are a standard size. Almost any shower head manufactured in the United States will fit on the shower arm installed in your bathroom. There is no such animal as "fine threads." All piping uses the NPT Standard defined above. Almost all bathroom fixtures are 1/2 NPT threads.

Is it toxic for water use?

no it is not its stainless steel

What is the T.P.I. of the male side?

They are 3/4 NPT on the out side and 1/2 NPT on the inside. NPT stands for National Pipe Taper. You have to screw it in to a 3/4 NPT and you have to screw into to the middle with a 1/2 NPT. No ifs, ands or buts. The thread pitch of a 1/2 NPT is 14 per inch. Hope that helps!

Brand	DAN SPEED
Model Number	WJ0061
Colour	Silver
Product Dimensions	5 x 4 x 4 cm; 0.28 g
Material	Stainless Steel
Item Weight	0.28 g

SuperWhole 3/4" Male x 1/2" Female Thread Reducer Bushing Pipe Fitting SS 304 BSPT New

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