Pressure washer hoses come in three main diameters: 1/4", 5/16" and 3/8". Choosing the right size is important because it affects water flow, pressure, hose weight and how well your machine performs. This guide explains which hose size you need based on your washer’s PSI and typical cleaning jobs.
The Three Common Hose Diameters
1/4" Hose (Most Common)
- Used on most electric pressure washers
- Best for 1,300–2,700 PSI
- Lightweight and easy to handle
5/16" Hose (Mid-Range Option)
- Offers slightly more water flow
- Typical range: 2,700–3,600 PSI
- Great for small petrol washers
3/8" Hose (Heavy-Duty)
- Used on petrol machines and commercial washers
- Supports 3,000–6,000+ PSI
- Better for long hose lengths (50–100 ft)
Which Hose Size Should You Choose?
Use this quick match-up chart:
| Washer PSI | Recommended Hose Size |
|---|---|
| 1,300–2,000 | 1/4" |
| 2,000–2,700 | 1/4" |
| 2,700–3,600 | 5/16" |
| 3,000–6,000 | 3/8" |
Does Hose Diameter Affect Pressure?
- Yes — smaller hoses increase pressure slightly
- Larger hoses increase water flow
- 3/8" hoses stay strong over long distances
The goal is to balance pressure with flow. Petrol washers benefit from 3/8" hoses because they can push more water volume.
Electric vs Petrol Washer Recommendations
Electric Pressure Washers
- Use 1/4" hoses only
- Best length: 20–30 ft
Petrol Pressure Washers
- Use 5/16" or 3/8" hoses
- Best length: 50–100 ft
What If Your Connectors Don’t Match?
You can use a universal adapter kit to convert:
- M22 → Quick-Connect
- Quick-Connect → 1/4" or 3/8"
- 3/8" → 1/4"
This allows you to use any hose diameter with your spray gun or pressure washer.
