Annovi Reverberi (AR) Pump Parts Compatibility Guide
Fast answer: Annovi Reverberi (AR) pumps are grouped into model families — RK, RKA, RKV, XRC, and XRA are the most common on commercial pressure washers — and parts are matched by family and plunger diameter, not by brand alone. Find your exact model on the pump's metal data plate before ordering a seal kit, valve, or rebuild kit.
Why AR Pump Compatibility Trips People Up
Annovi Reverberi supplies pumps to a huge range of pressure washer manufacturers — including private-label machines sold under other brand names — so the badge on your machine's cabinet often isn't an AR badge at all, even when the pump inside is. That's the single most common mistake in ordering AR parts: searching by the machine's brand name instead of the pump's actual model number, which is stamped on a metal plate on the pump itself, not the machine frame.
Common AR Pump Families
| Series | Typical use | Notes |
|---|---|---|
| RK | Commercial hot & cold water | Widely used across multiple machine brands; many sub-models (e.g., RK 11.14 N, RK 13.12 N) |
| RKA | Commercial, higher-duty | Sub-models like RKA 3.5 G22 N, RKA 4 G20 N denote GPM/PSI variants |
| RKV | Vertical shaft, direct-drive machines | Common on gas-engine direct-drive units |
| XRC / XRA | Compact commercial and semi-pro | Share seal kit sizing with several RK models |
The sub-model number (the numbers after the series letters) generally encodes GPM and PSI — for example, a "3.5" prefix typically indicates roughly 3.5 GPM. Always confirm against your specific data plate rather than assuming from the pattern alone, since AR revises model numbering across production runs.
Water Seal Kits: The Most-Ordered AR Part
AR water seal kits are generally sized by the plunger diameter, most commonly 18mm or 20mm on commercial-duty pumps. An 18mm kit is commonly listed as fitting RK, RKA, RKV, XRC, and XRA series pumps; a 20mm kit covers a different (typically higher-flow) subset of RK and RKA models. Ordering the wrong diameter is the most common return reason on pump seal kits — measure or confirm your plunger size from the pump's documentation before ordering rather than assuming from the series letters alone.
How to Identify Your Exact AR Pump
- Locate the metal data plate riveted or stamped directly onto the pump body — not a sticker on the machine's frame or cabinet.
- Record the full model string exactly as printed, including any letter suffixes (N, H, C) — these often indicate specific configuration details that affect parts fitment.
- Note the stated GPM and PSI, which confirm you've got the right variant if the model number is worn or partially illegible.
- If no plate is present or it's unreadable, the plunger diameter can usually be measured directly, or cross-referenced from the machine manufacturer's parts manual.
Rebuilding vs. Replacing an AR Pump
Because AR pumps are widely used and well-supported by the aftermarket, a full rebuild kit — water seals, oil seals, valves, and often the plungers — is almost always more economical than replacing the whole pump, provided the pump head and manifold aren't cracked and the plunger bores aren't scored. Bundle the repair: if you're already opening the pump to replace water seals, replace the oil seals and valve sets in the same service, since the labor to access them is identical whether you replace one component or all three.
Browse replacement pumps and seal kits, or see our general parts buying guide for how to diagnose which component is actually failing before you order.
Frequently Asked Questions
How do I know if my machine has an AR pump if the cabinet says a different brand?
Check the pump itself, not the cabinet badge — AR supplies pumps to many machine manufacturers under private label. The pump's own data plate will show the AR model number regardless of what brand is printed on the machine.
What's the difference between RK and RKA series?
Both are commercial triplex pump families; RKA generally denotes a higher-duty variant within the same physical footprint. Fitment is determined by the specific sub-model and plunger diameter, not the letter designation alone.
Can I use an 18mm seal kit on a 20mm pump?
No — plunger diameter must match exactly. An incorrectly sized seal kit will not seat properly and will fail quickly, if it fits at all.