Raincovo Downstream Injector Kit, 3/8" Quick Connect
- 3/8" quick connect
- 1/4" quick connect
- Rated 4,000 psi (as listed)
- Brass, Polyvinyl Chloride (PVC)
- 3.9★ from 1,067 ratings
Where to buy
Raincovo sells through its Amazon store. Price is not quoted here because Amazon renders it client-side and any figure on this page would be wrong within days.
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In stock when we last checked, on 2026-09-11. As an Amazon Associate we earn from qualifying purchases; the link is tagged and it costs you nothing.
The Raincovo Downstream Injector Kit, 3/8" Quick Connect is a chemical injector kit sold by Raincovo on Amazon under ASIN B08SW7JZTL. The model number on the listing is ROF8W58. Everything on this page is read off that listing — the specification table, the bullets and the photographs are Raincovo's own, and the comparisons are against the rest of Raincovo's range rather than against a marketing claim.
It was in stock when we last checked, on 2026-09-11. Among Raincovo's gauges, wands and injectors it is the most-reviewed of 5.
Specification
| Material | Brass, Polyvinyl Chloride (PVC) |
|---|---|
| Item dimensions L x W x H | 6.1 x 6.1 x 2.2 inches |
| Exterior Finish | Brass, Stainless Steel |
| Inlet Connection Size | 0.38 inches |
| Inlet Connection Type | Barb |
| Outlet Connection Type | Quick Connector |
| Maximum Operating Pressure | 4000 psi |
| Number of Ports | 2 |
| Outlet Connection Size | 0.38 inches |
| Number of Items | 1 |
| Thread Size | 0.375 inches |
| Thread Type | Quick Connect |
| Full Amazon title | Raincovo Downstream Injector for Pressure Washer, Chemical Injector Kit |
Straight from the Amazon listing's own attribute table. Fields the seller has clearly filled in wrong — a "hose length" of one inch on a brass fitting — are dropped rather than reprinted.
What ships in the box
Kit Includes chemical injector, 10 feet siphon hose, filter, black nozzle soap with 1/4” quick connect and teflon tape.
What Raincovo says it does
These are the manufacturer's own claims, quoted from the listing.
Application
When detergent is sucked out separately, the chemical will not pass through the pump, you could use a variety of chemicals without damaging the pump.
Characteristic
Chemical injector kit with a metering valve, which can adjust dilution ratio of soap and water. Avoid clogging of the injector and improve the efficiency of pressure washer.
Connector
Downstream Injector has 3/8 inch quick connect. Fits most electric and gas power washer. It's connected between the pressure washer pump and the pressure washer hose.
Material
Siphon hose is made of high-quality PVC, used for hot and cold water (32°F to 122°F). Adapter is made of brass and stainless steel. Max pressure is 4000 PSI. Flow rate is 2 to 5 GPM.
How it compares with Raincovo's other gauges, wands and injectors
| Model | Connection | Rated to (as listed) | Bottle / pieces | Rating | Availability |
|---|---|---|---|---|---|
| Downstream Injector Kit, 3/8" Quick Connect ← this one | 3/8" quick connect, 1/4" quick connect | 4,000 psi | — | 3.9★ | In stock |
| Pressure Washer Gauge, 6000 PSI | 3/8" quick connect | reads to 6,000 psi | — | 4.6★ | In stock |
| Chemical Injector Kit, 1/8" BSP Thread | 1/8" 27 BSP thread | — | 10 pieces | 4.4★ | In stock |
| Extension Wands, Straight and 15° Angled | 1/4" quick connect | 4,000 psi | 2 pieces | 4.6★ | In stock |
| Siphon Hose for Downstream Injector, 10 ft | — | — | — | 4.5★ | In stock |
With 3.9★ from 1,067 ratings, 4 of Raincovo's 5 gauges, wands and injectors with at least twenty ratings score higher: Pressure Washer Gauge, 6000 PSI, Chemical Injector Kit, 1/8" BSP Thread, Extension Wands, Straight and 15° Angled, Siphon Hose for Downstream Injector, 10….
How it connects
A downstream injector sits between the pump outlet and the high-pressure hose, so the chemical never passes through the pump. The matching 10-foot siphon hose is sold on its own: Siphon Hose for Downstream Injector, 10 ft.
Raincovo's listings do not name the pressure washer brands they fit — Ryobi, Sun Joe, Greenworks and the rest are not mentioned. What decides fit is the connector on your gun, wand or pump. The Raincovo Foam Cannon Parts, Bottles and Orifices guide goes through it.
Questions
Can I still buy the Raincovo Downstream Injector Kit, 3/8" Quick Connect?
Yes — it was in stock on Amazon at our last check, on 2026-09-11.
What does it connect to?
The listing gives 3/8" quick connect and 1/4" quick connect. Check that your pressure washer's gun, wand or pump has the matching fitting — the listings do not name washer brands.
What pressure is it rated for?
The listing's attribute table gives 4,000 psi. That is the seller's figure, not one we have tested.
How is it rated?
3.9 out of 5 from 1,067 Amazon ratings at the time this page was built.
Who makes Raincovo?
Raincovo names itself as the manufacturer on its Amazon listings and sells through its own Amazon store.
