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Campground water pressure can vary from one site to the next, while an RV plumbing system has limits set by the coach manufacturer. The Camco 40058 adds an adjustable brass regulator and an easy-to-read gauge between the pedestal and the fresh-water hose. Its value is not a magic pressure number; it is giving the owner a controlled starting point and a visible reading.
Quick verdict
A sensible choice for RV owners who want more control than a fixed regulator provides and are willing to set it according to their coach manual. It is less appealing if you want a compact, set-and-forget fitting with no gauge to monitor.
Who this fits best
- Owners moving among campgrounds with inconsistent pressure
- Rigs whose manufacturer specifies a particular city-water limit
- Campers who want a visible pressure reading during setup
Pre-purchase checklist
- Confirm the pressure limit in the RV manual before adjusting anything.
- Inspect the gauge, threads, washer, hose, and inlet for damage or leaks.
- Put the regulator at the campground spigot so the hose is protected too.
- Open the water gradually, check the reading under flow, and recheck for leaks.
What the 40058 changes
A fixed regulator typically reduces pressure to one preset target. The 40058 starts from a factory setting around 45 psi and can be adjusted, but an owner should never raise it simply to chase stronger shower flow. Restrictions in filters, hoses, screens, and valves can reduce flow even when pressure is adequate. Troubleshoot those restrictions before increasing the setting.
Fit and setup details that matter
The regulator uses common garden-hose-style connections, but every connection still needs a sound washer and straight threading. Support the assembly so the brass body and gauge do not hang awkwardly from a worn pedestal. Flush the campground spigot before connecting potable-water gear, and keep fresh-water equipment separated from sewer equipment.
Who should skip it
If your coach manual calls for a fixed maximum and you do not want to verify a gauge, a quality fixed regulator may be simpler. A leaking, damaged, frozen, or inaccurate gauge should not be treated as trustworthy. The regulator also does not sanitize the water or replace a filter where water quality calls for one.
Bottom line
A sensible choice for RV owners who want more control than a fixed regulator provides and are willing to set it according to their coach manual. It is less appealing if you want a compact, set-and-forget fitting with no gauge to monitor. Verify the exact model, current specifications, and compatibility before ordering, because manufacturers and marketplace listings can change.
Sources and editorial note
RVGearScout reviewed manufacturer information and safety guidance for this article. This is an independent research-based guide; it does not claim hands-on testing.
Featured photo by Brad King on Unsplash.