Tool · Mainline tubing
Drip tubing size finder
A drip fitting finder by tubing size: pick your OD to see each maker's ID and OD and the compression, locking-nut and barbed fittings listed for it.
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Short answer
Pick the tubing size you measured or read on the tubing to open its page. It shows the ID and OD each maker lists for that size, the compression, locking-nut and barbed fittings whose makers list it, the reducers, and "Not confirmed" wherever no source states a field. Buy fittings from that page, not from the "1/2 in" label.
Picks this tool points toSee the shortlist
- Raindrip Smart Loc S5600UB universal coupling (0.620, 0.700 and 0.710 in OD)Check price on Amazon
- Raindrip Smart Loc S5500UB universal tee (0.620, 0.700 and 0.710 in OD)Check price on Amazon
- Drip Depot 3/4 in black polyethylene tubing (0.820 x 0.940 in, 100 ft)Check price on Amazon
- 1/2 in tubing at .620-.630 in OD
- 1/2 in tubing at .700 in OD
- 1/2 in tubing at .710 in OD
- 3/4 in tubing at .940 in OD
- 1/4 in polyethylene microtubing
- 1/4 in vinyl microtubing
- Metric 4/6 and 4/7 mm microtubing
- Metric 16 and 17 mm tubing and fittings
Choose your tubing size to see the key facts and what fits. Each fact links to its source on the full page.
The sizes at a glance
| Tubing size | Outside diameter | Inside diameter | Compression fittings for this OD | Locking-nut and universal fittings |
|---|---|---|---|---|
| 1/2 in tubing at .620-.630 in OD | .620 in (Raindrip); 0.63 in (Rain Bird T63) | .520 in for Raindrip's .620 in OD pair. Rain Bird gives no ID for T63 | DIG green-insert compression fittings: .620-.630 in OD. Rain Bird Easy-Fit: 0.63-0.70 in OD, 0-60 psi | Raindrip Smart Loc S5600UB lists .520 x .620 in (up to 50 psi). Orbit 67466 coupling and 67468 end cap: .620-.710 in OD. DIG NUTLOC: .530, .600 or .620 in ID, described as .630-.710 in OD |
| 1/2 in tubing at .700 in OD | .700 in (DIG, Mister Landscaper, Raindrip); 0.70 in (Rain Bird T70) | .600 in (DIG, Mister Landscaper, Raindrip's Smart Loc pair). Rain Bird gives no ID for T70 | DIG black insert: C33 coupling, C35 tee and C36 elbow, all .700 in OD. Rain Bird Easy-Fit: 0.63-0.70 in OD, 0-60 psi | Raindrip Smart Loc S5600UB (.600 x .700 in, up to 50 psi); Orbit 67466 (.620-.710 in OD); Orbit 67491 Drip-Lock push-on (.690, .700 and .710 in OD); DIG NUTLOC (.600 in ID, within .630-.710 in OD); Mister Landscaper MLF locking-collar fittings for its MLT tubing |
| 1/2 in tubing at .710 in OD | .710 in (Raindrip 062010P, DIG TS100/TS500); 0.71 in (Rain Bird T71) | .620 in (Raindrip 062010P, DIG TS100/TS500, Raindrip's Smart Loc pair). Rain Bird gives no ID for T71 | DIG blue insert (.710 in OD): C43 coupling, C45 tee and C46 elbow. Rain Bird Easy-Fit is listed for 0.63-0.70 in OD, which does not include 0.71 in | Raindrip Smart Loc S5600UB (.620 x .710 in, up to 50 psi); Orbit 67466 (.620-.710 in OD); Orbit 67491 Drip-Lock push-on (.690, .700 and .710 in OD); DIG NUTLOC (.620 in ID, within .630-.710 in OD) |
| 3/4 in tubing at .940 in OD | 0.940 in (23.8 mm), DIG | 0.820 in (20.8 mm), with a 0.060 in wall, DIG | Not confirmed | Not confirmed |
| 1/4 in polyethylene microtubing | .250 in (DIG); 0.25 in (Rain Bird XQ) | .170 in (DIG, including B38P in its G77AS kit); 0.17 in (Rain Bird XQ) | Not confirmed | Not confirmed |
| 1/4 in vinyl microtubing | DIG 1/4 in: .245, .220 and .250 in; DIG 1/8 in: .187 in; DIG 12-018: .270 in; Mister Landscaper: .295 in | DIG 1/4 in: .156, .160 and .170 in; DIG 1/8 in: .118 in; DIG 12-018: .160 in; Mister Landscaper: .145 in | Not confirmed | Not confirmed |
| Metric 4/6 and 4/7 mm microtubing | Claber names the family 4-6 mm. AquaGrow gives no number and tells buyers to confirm the actual outer dimension | Antelco SPEC Drip: outlet barb for 4 mm ID tubing. AquaGrow tells buyers to confirm the actual inner dimension | Not confirmed | Not confirmed |
| Metric 16 and 17 mm tubing and fittings | Rain Bird XFD: 16.1 mm (0.634 in). Rain Bird Easy-Fit: listed for 16-18 mm (0.63-0.70 in) OD | Rain Bird XFD: 13.6 mm (0.536 in). A distributor lists Irritec's 600 Series hose coupling for .590-.630 in ID | Rain Bird Easy-Fit: 16-18 mm (0.63-0.70 in) OD, 0-60 psi | DIG lists NUTLOC by inch ID and OD (.630-.710 in OD); its metric labels read 16, 18 mm in one place and 16, 17, 18 mm in another |
How the data is built
Every value comes from the makers' own product pages, catalogs and FAQs, read on 2026-10-15, and each field carries its source on the size's page. We do not measure tubing ourselves, and we do not fill gaps from reseller listings. Where no maker states a field, the page says "Not confirmed".
Some examples of what the pages draw on:
- DIG lists its 1/2 in tubing at .600 in ID x .700 in OD.[1]
- Raindrip's 062010P supply tubing is .620 in ID x .710 in OD.[2]
- Rain Bird sells T63, T70 and T71 tubing at 0.63, 0.70 and 0.71 in OD, with no ID given.[3]
- DIG's green-insert compression fittings are listed for .620 to .630 in OD,[4] and its blue-insert fittings for .710 in OD.[4]
- Rain Bird's Universal Easy-Fit compression fittings are listed for 0.63 to 0.70 in OD.[5]
- DIG's NUTLOC fittings are listed for .530, .600 or .620 in ID tubing, described as .630 to .710 in OD.[6]
- DIG's vinyl micro tubing table lists 1/4 in sizes of .156 x .245, .160 x .220 and .170 x .250 in.[7]
A range is the maker's statement
When a fitting page says ".620 to .710 in OD", that is the maker's stated range, not a guarantee that every tubing in the range seals. Stay inside the stated numbers, and if your tubing sits at the edge of a range, prefer a fitting made for that exact OD.
If you do not know your size
Measure a clean cut end with calipers, or read the print on the tubing or its old packaging. The measuring guide shows how, and the 1/2 in size guide explains why three ODs share one name.
Next
- How to measure drip tubing before you buy fittings
- Drip mainline fittings by OD
- Drip connection type finder
- 1/2 in tubing at .620-.630 in OD
- 1/2 in tubing at .700 in OD
- 1/2 in tubing at .710 in OD
- 3/4 in tubing at .940 in OD
- 1/4 in polyethylene microtubing
- 1/4 in vinyl microtubing
- Metric 4/6 and 4/7 mm microtubing
- Metric 16 and 17 mm tubing and fittings
Choose your tubing size to see the key facts and what fits. Each fact links to its source on the full page.
Shop what this tool points toSee the shortlist
- Raindrip Smart Loc S5600UB universal coupling (0.620, 0.700 and 0.710 in OD)Check price on Amazon
- Raindrip Smart Loc S5500UB universal tee (0.620, 0.700 and 0.710 in OD)Check price on Amazon
- Drip Depot 3/4 in black polyethylene tubing (0.820 x 0.940 in, 100 ft)Check price on Amazon
Questions
My tubing just says 1/2 in. Which size do I pick?
Measure the OD of a clean cut end, or find the maker's model on the tubing. 1/2 in tubing is sold at about .620, .700 and .710 in OD; DIG lists .600 x .700 in and Raindrip's 062010P is .620 x .710 in.[1][2]
Why does a field say 'Not confirmed'?
Because no maker page, catalog or FAQ we read states it. Rain Bird, for example, gives the OD of its T63, T70 and T71 tubing but no ID.[3]
Does a fitting range guarantee a seal?
No. A range like Rain Bird Easy-Fit's 0.63-0.70 in OD is the maker's statement of what it is made for. Stay inside it.[5]