Sumi Soaker Mark II Kit — Overhead Irrigation System
5.0 out of 5 · 1 reviewOverhead mist irrigation for low pressure and tight spaces. Mark II throws a steep 80° spray about 13 ft wide that clears taller crops, and it runs on a garden hose, a small well or a gravity tank.
- Steep spray for tunnels and taller crops. An 80° spray reaches up to about 6.5 ft high in a 13 ft footprint, so it waters over crops and fits narrow blocks.
- Runs on low pressure. Rated at about 12 PSI and keeps spraying down to about 3 PSI, so garden hoses, small wells and gravity tanks all work.
- Easy on your water. About 3.6 GPM for a 100 ft line. Use the free System Planner to size beds against your water supply.
- Built for daily farm use. UV-stabilized polyethylene, made in Japan by Sumika Agritech. Modern Grower is the main US source.
What's in the kit
One roll of Mark II tubing plus the parts to run it: Mark II Tube Starter Connector, 1 in threaded adapter (G1 parallel to standard NPT), Fabric Filter and Mark II End Stopper. Add a Garden Hose Connector or Mainline Connector to hook up to your water.
Free shipping on orders over $25 in the Lower 48 · Most orders ship within 24 hours
- 13 ft Spray width, 6.5 ft each side
- 12 PSI Rated pressure · about 3 PSI minimum
- 80° Steep spray, up to about 6.5 ft high
- 3.6 GPM Flow for a 100 ft line
Mark II at rated pressure (0.08 MPa). Source: Sumika Agritech manufacturer specifications.
Steep spray, narrow footprint
Lay the tube down the path. Fine streams rise steeply and fall about 6.5 ft on each side, a 13 ft rectangle that fits tunnels and narrow bed blocks.
Gentle enough for seed
Fine streams settle on the bed without washing out carrot or lettuce seed or crusting the soil.
Made for tunnels
The tight footprint keeps water on the beds instead of the paths and tunnel walls.
Clears taller crops
The steep spray arcs over plants that would block a wide, low pattern. Riser clamps lift it higher when you need to.
R-Wide or Mark II?
Same tubing family, two different jobs. Pick by your water pressure, your flow and how tall your crops get.
R-Wide
Open-field workhorseLow, wide spray. One line down the center path covers eight 30 in beds.
- Spray width
- 33 ft
- Pressure
- 30 PSI rated · 15 PSI min
- Flow, 100 ft line
- 12.7 GPM
- On a garden hose
- Up to about 50 ft lines
you water open field beds, have good pressure and flow, and grow mostly low crops like greens, roots and alliums.
Mark II
You're hereSteep 80° spray that throws up and over taller crops in a tighter footprint.
- Spray width
- 13 ft
- Pressure
- 12 PSI rated · 3 PSI min
- Flow, 100 ft line
- 3.6 GPM
- On a garden hose
- Any length, almost any hose
you grow in a greenhouse or high tunnel, have low pressure or limited flow, or water around taller crops.
Time how long your hose takes to fill a 5-gallon bucket. The Water Supply Check turns that into a recommendation; the System Planner sizes your tubing and fittings.
Will your water keep up?
Mark II needs about 0.036 GPM per foot of line at 12 PSI, so a 100 ft line uses 3.6 GPM. Almost any garden hose can supply that. It keeps spraying down to about 3 PSI, with a narrower pattern.
| Line length | Flow needed | On a garden hose? |
|---|---|---|
| 25 ft | 0.9 GPM | Yes, any hose |
| 50 ft | 1.8 GPM | Yes, any hose |
| 100 ft | 3.6 GPM | Yes, almost any hose |
| 328 ft (full roll) | 11.9 GPM | Most hoses. A long hose may need 3/4 in |
Do you have everything you need?
The kit covers everything on the tubing side. You add one connector for your water source.
-
roll -
Feeds water into the tube -
Adapts G1 parallel threads to NPT -
Catches grit before it reaches the tube -
Closes the far end
Pick your water-source connector
Add one connector to match how you feed the line.
| Compare | Garden Hose Connector | Mainline Connector |
|---|---|---|
| Connects to | Standard garden hose thread | 1 in PVC (slip) or 1 in poly |
| Best for | Most Mark II setups, any line length | Several zones off a 1 in mainline |
| Regulator | 12 PSI, included | 12 PSI, included |
Cutting into multiple runs?
Each run needs its own starter connector, filter and end stopper. Add one Add-on Kit for each extra run.
| Runs | Add-on Kits |
|---|---|
| 1 (no cuts) | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
Commonly purchased together
-
Garden Hose Connector
If you're running off a hose bib. 12 PSI regulator included.
$39.50 -
Mainline Connector
For a 1 in PVC or poly mainline. With or without regulator.
From $55.00Choose -
Add-on Kit
For each additional run beyond the first.
$14.50 -
Riser Clamps
Lift the line above taller crops so the spray clears the canopy.
From $5.50Choose
Specs at a glance
- Operating pressure
- About 3–12 PSI (12 rated)
- Spray width
- 13 ft at rated pressure · narrower at low pressure
- Spray angle
- 80°
- Spray height
- Up to about 6.5 ft
- Flow
- 0.036 GPM per ft of line
- Flow, 100 ft line
- 3.6 GPM
- Longest single run
- 328 ft
- Filtration
- 80 mesh
- Made by
- Sumika Agritech, Japan
Rated at 0.08 MPa. Source: Sumika Agritech.
Questions growers ask
Still not sure? Email hello@moderngrower.co or call 877-850-1555.
Can I run Mark II off a garden hose?
Yes, at almost any length. A 25 ft line needs about 0.9 GPM and a 100 ft line about 3.6 GPM. Even the full 328 ft roll needs only about 11.9 GPM, which most hoses can deliver, though a long hose may need to be 3/4 in.
Why does it come with a 12 PSI regulator?
Mark II is rated at about 12 PSI. Both water-source connectors include a 12 PSI regulator, so the line runs at the right pressure from a hose bib or mainline.
Will it run on a gravity tank or low-pressure well?
Yes. Mark II keeps spraying down to about 3 PSI, with a narrower pattern at low pressure. A tank raised about 7 ft gives roughly 3 PSI.
Does it work in a high tunnel?
That's where it shines. The steep 80° spray covers about 13 ft and reaches up to about 6.5 ft high, so it waters over taller crops and stays off the tunnel walls.
Can I use R-Wide parts with Mark II?
Not all of them. The Tube Starter Connector, Tube Coupling and End Stopper come in Mark II and R-Wide versions and don't cross over, so order the Mark II versions. Riser clamps fit both.
How many Add-on Kits do I need for the 328 ft roll?
Count your runs and subtract one. Three runs need two Add-on Kits.
What filter do I need?
80 mesh. The kit includes a fabric filter. Add upstream filtration if you're on a well, pond or river with sediment.
Main US source
Modern Grower is the main US source for Sumi Soaker (Sumisansui) tubing from Sumika Agritech.
Support from people who use it
Questions go to our team, with a direct line to the manufacturer. hello@moderngrower.co · 877-850-1555
Ships from the US
In stock, with most orders out within 24 hours. Free shipping over $25 in the Lower 48.
About Sumi Soaker Mark II overhead irrigation tubing
Sumi Soaker Mark II is overhead irrigation tubing made in Japan by Sumika Agritech, also sold as Sumisansui. It is the low-pressure member of the family: a flat polyethylene tube with laser-cut holes that fills at about 12 PSI and throws fine streams steeply up and out, covering a rectangle about 13 ft wide.
Where Mark II fits
The steep 80° spray reaches up to about 6.5 ft high and falls about 6.5 ft on each side of the line. That tight, tall pattern suits high tunnels, greenhouses and narrow bed blocks, and it waters over taller crops that would block a wide, low spray. Because it keeps working down to about 3 PSI, Mark II also runs on garden hoses, small wells and gravity-fed tanks where R-Wide would not.
Sizing Mark II to your water
Mark II uses about 0.036 GPM per foot of line at rated pressure: roughly 0.9 GPM for 25 ft, 1.8 GPM for 50 ft and 3.6 GPM for 100 ft. Even the full 328 ft roll needs only about 11.9 GPM, which most hoses can supply. Both water-source connectors include a 12 PSI regulator.
Mark II or R-Wide
R-Wide is the wide, low-angle tubing for open field production, covering about 33 ft from one line at 30 PSI. Choose Mark II for low pressure, limited flow, tunnels and taller crops, and R-Wide for big open blocks with strong water.
Setup and care
Kits come cut to length with the Mark II starter connector, threaded adapter, fabric filter and end stopper. The full 328 ft roll can be cut into shorter runs with one Add-on Kit per extra run. Fittings hand-tighten, and with 80 mesh filtration and seasonal storage the tubing gives years of service.