do these fit standard american 1/4 inch tube?

I had to use a heat gun to get the 1/4" tube over the connector. Someone else suggested hot water which I'm sure works but is a little impractical for field use. I happen to have a cordless heat gun so that's perfect.

About how many can be connected to a 1/2" drip line with about 30 psi?

These are 1/4 in not 1/2 in but I suppose you could use adapters to get to 1/2 in tubing. I would think it depends on your pressures, mine here are high so it would prob work. All mine are 1/4 in.

At 25 psi, what is the minimum/maximum water flow/volume per hour for this product?

Hi, this drip irrigation emitter has a flow rate of 0-120L/H; the drip emitters discharge is also adjustable, you can adjust the drip head to get the water flow you want

What is the differnce between this one & other model that does not have extra barb? Is extrabard the only difference?

Not sure about the extra barb, but these trip emitters work well, the adjustable head functions as described. Fits tight inside 1/4 tubing, does not separate or split.

ASIN	B0914T1LHN
Best Sellers Rank	#3,070 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #2 in Automatic Irrigation Drippers
Brand	La Farah
Brand Name	La Farah
Control Type	Adjustable Drip Irrigation Emitters
Fit Type	Barbed Tubing Connection
Included Components	50pcs drip irrigation emitters with stake
Item Dimensions	5.28 x 0.94 x 0.55 inches
Item Shape	Red Irrigation Dripper
Item Weight	231 Grams
Item dimensions L x W x H	5.28 x 0.94 x 0.55 inches
Manufacturer	La Farah
Material	plastic
Maximum Pressure	3 Bars
Model Name	50pcs Drip Irrigation Emitters wish Stake
Model Number	50pcs Drip Irrigation Emitters
Number of Pieces	1
Number of Sets	1
Plant or Animal Product Type	Flower
Size	50pcs Drip Emitters for 1/4" Tubing
Special Features	Adjustable
Style	Adjustable Drip Irrigation Emitters

50pcs Drip Emitters for 1/4" Drip Irrigation Tubing, Adjustable 360 Degree Water Flow Drippers on 5" Arrow Stake, Garden Irrigation Drippers for (4-7mm) Watering System

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