Reference

Drip tubing sizes: 1/2 in, 3/4 in, 1/4 in and metric, by OD

Pick a tubing size to see its inside and outside diameters, where each number comes from, and the fittings, emitters and adapters whose makers list that size.

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Your tubing size

Choose your tubing size to see the key facts and what fits. Each fact links to its source on the full page.

Fits the most tubing sizes

Fits 3 of 6Raindrip Smart Loc S5600UB universal coupling (0.620, 0.700 and 0.710 in OD)S5600UB coupling, 1 pieceCheck price on Amazon
Fits 2 of 6Raindrip Smart Loc S5500UB universal tee (0.620, 0.700 and 0.710 in OD)S5500UB tee, 1 pieceCheck price on Amazon

All tubing sizes

1/2 in tubing at .620-.630 in OD The smallest 1/2 in OD: Raindrip's .520 x .620 in pair and Rain Bird T63 at 0.63 in. Which compression, nut-lock and reducing fittings list it.1 product that fit
1/2 in tubing at .700 in OD DIG, Mister Landscaper and Raindrip list .600 x .700 in; Rain Bird sells T70 at 0.70 in OD. The compression, nut-lock, push-on and thread adapters for it.2 products that fit
1/2 in tubing at .710 in OD Raindrip 062010P and DIG list .620 x .710 in; Rain Bird sells T71 at 0.71 in OD. DIG's blue inserts and nut-lock fittings list it; Easy-Fit does not.2 products that fit
3/4 in tubing at .940 in OD DIG lists 3/4 in poly tubing at .820 x .940 in with a .060 in wall, up to 60 psi. What makers state about it, and which fittings are not confirmed.1 product that fit
1/4 in polyethylene microtubing DIG lists 1/4 in poly at .170 x .250 in and Rain Bird XQ at 0.17 x 0.25 in, 0-60 psi. The barbs, takeoffs, stakes and plugs makers list for it.3 products that fit
1/4 in vinyl microtubing DIG lists three 1/4 in vinyl sizes plus 1/8 in, up to 30 psi; Mister Landscaper's vinyl is .145 x .295 in. Sizes, pressure and heat catches.
Metric 4/6 and 4/7 mm microtubing Claber sells 4-6 mm tube as 1/4 in; AquaGrow's 4/7 mm tee asks buyers to confirm the actual sizes. What is stated, and what is not, for metric microtubing.
Metric 16 and 17 mm tubing and fittings DIG labels its 1/2 in barbs 16 and 17 mm, Rain Bird's XF insert fittings are 17 mm, and Easy-Fit lists 16-18 mm OD. Netafim gives inch values only.