Hello. How many come in one order? $18.65 for one seems unreasonable.

Just one, it's a rip-off. I way better deal is this one: https://www.amazon.com/Bloom-Brothers-GGWR09-Hydro-9-Inch/dp/B0055F55O6/ref=pd_sbs_1?pd_rd_w=5ObyP&pf_rd_p=ed1e2146-ecfe-435e-b3b5-d79fa072fd58&pf_rd_r=A0NCERTVNXV75T3S11TA&pd_rd_r=748651a6-63aa-46a4-b27d-ae4b186b9021&pd_rd_wg=BQRzD&pd_rd_i=B0055F55O6&psc=1

What size pump is recommended?

I use a 400 gph aquarium pump for my setup. It will water 6 plants in less than 20 seconds. It all depends on your setup.

Could they work using gravityfeed insead of a pump

Although I have not used them in a gravity feed setup, I bet you could do so, provided you had enough head on the source water. At least a meter/yard height should work.

Is there a 1/4-inch option?

No at least not this model as it is a solid mold.

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Description

The Hydro Flow Irrigation Fitting Rain Ring Drip Emitter features strategically positioned distribution holes for thorough coverage
Can be used with any type of growing media
The 3 removable stakes enable you to position the ring at the ideal height for the plants
Use when growing indoor or outdoor without worry thanks to the heavy duty construction
The 6-inch ring has a built-in 1/2-inch inlet fitting

HYDROFLOW Rain Ring - 6"