The Chemical Injector DN10 Bypass Kit lets you switch from soap to full-pressure rinse by turning one valve. Close the DN10 valve and the injector draws chemical. Open it and flow bypasses the injector for an unrestricted rinse. Pick the orifice that matches your machine's GPM.
Key Features
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Full-flow DN10 bypass: Open the valve to rinse at full pressure, close it to draw chemical. The injector sits out of the flow path during rinse, so it wears less.
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Matched to your flow: Three orifice sizes. 1.8mm for 2-3 GPM, 2.1mm for 3-5 GPM, 2.3mm for 5-8 GPM. The right match is what makes it draw.
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Italian MTM Hydro components: A DN10 ball valve and venturi injector made in Italy, assembled into a kit in the USA.
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Stainless quick connects and tees: SH-tolerant stainless on the fittings instead of the brass quick connects that corrode.
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Comes ready to plumb: Ships with the 18" black KobraJet jumper hose, the chemical siphon tube, and a chemical filter.
Specifications
| Brand |
MTM Hydro / Veloci (Italian-made, assembled in USA) |
| Type |
Downstream venturi injector with a full-flow DN10 bypass loop |
| Orifice / flow |
1.8mm (2-3 GPM), 2.1mm (3-5 GPM), or 2.3mm (5-8 GPM) |
| Max pressure |
3,000 PSI (capped by the DN10 brass valve) |
| Max temperature |
176°F (capped by the DN10 brass valve) |
| Chemical draw |
Up to 20% of flow, around 10-18% in practice |
| Material |
Brass DN10 valve and injector body, stainless tees and quick connects, PTFE and Viton seals |
| Threads |
DN10 valve 3/8" BSP, injector and hose 3/8" NPT |
| Hose |
18" black KobraJet, rated 4,000 PSI |
| Assembly |
Ships unassembled. Teflon tape or thread-lock at the fittings. |
What's Included
- DN10 plated-brass bypass ball valve
- Downstream chemical injector at your chosen orifice (1.8mm, 2.1mm, or 2.3mm)
- Stainless steel tees and quick connects
- Chemical siphon tube and filter
- 18" black KobraJet jumper hose, rated 4,000 PSI
Fits cold-water downstream pressure-wash systems inside the orifice's GPM band. Installs after the pump and unloader, ahead of the reel. It only draws when you fit a wide soap nozzle, since a narrow high-pressure tip holds too much back pressure for the venturi to pull. The DN10 valve is BSP and the injector and hose are NPT, so wrap the threads with Teflon or add thread-lock when you assemble it.
How It Works
Water forced through the small orifice speeds up and loses pressure. That drop pulls chemical up the siphon tube, past a check ball, and into the stream. Fit a wide soap nozzle so system pressure falls and the injector draws. Fit a high-pressure tip and the back pressure shuts the draw off.
The bypass is the DN10 ball valve plumbed in parallel with the injector. Close it and flow routes through the injector to soap. Open it and flow skips the injector for a full-pressure rinse or surface-clean pass. One valve switches soap to rinse instead of swapping tips, and it keeps full flow off the injector during rinse.
Pairs Well With
Frequently Asked Questions
Which DN10 bypass kit orifice do I need?
Match it to your machine. 1.8mm for 2-3 GPM, 2.1mm for 3-5 GPM, 2.3mm for 5-8 GPM. A smaller orifice draws a higher percentage and holds up better on longer hose runs, a larger one suits a higher-GPM machine. Get the match wrong and it won't draw right.
Will this chemical injector kit draw SH?
Yes, at downstream strength, around 10 to 18% at the surface. That handles house washing, not strong roof mixes. The brass valve and injector body corrode under SH over time, so flush the chemical line with clean water after every job. For daily heavy SH, run a dedicated soft wash pump instead.
What's the max PSI and temperature?
3,000 PSI and 176°F. The brass DN10 valve is the limit, not the hose. The KobraJet hose is rated to 4,000 PSI, but the valve caps the kit at 3,000. Don't run it hotter than 176°F.
