AR20821-PKG | Mini-Matic 4/B Unloader Package GHA Filter Kit

AR20821-PKG by Annovi Reverberi — Complete Mini-Matic 4/B Unloader Plumbing Package | 2,600–2,800 PSI | 2.0–5.0 GPM | Forged Brass Body | Anodized Aluminum Housing | Garden Hose Adapter | Stainless Inline Filter | Banjo Bolts | Chemical Injection Port

The AR20821-PKG by Annovi Reverberi is a complete unloader plumbing package engineered for small to mid-size professional pressure washer systems that need stable pressure regulation, inlet filtration, automatic bypass protection, and chemical injection capability in one organized, installer-ready kit. Built around the proven Mini-Matic 4/B unloader valve (AR20821), the AR20821-PKG delivers a turnkey pressure regulation and plumbing solution rated for 2,600–2,800 PSI and 2.0–5.0 GPM — with a forged brass unloader body, anodized aluminum bypass and inlet housing, stainless steel inline filter, garden hose adapter, banjo bolts with O-rings and seals, pressure adjustment knob, and a chemical injection port, all pre-selected for compatibility and packaged together for fast, reliable installation. As part of Annovi Reverberi’s pump and unloader assemblies stocked and supported by WSHPWR, the AR20821-PKG is the correct specification for contractors, OEM builders, fleet operators, and service technicians who need a complete, fully compatible Mini-Matic 4/B unloader plumbing assembly across the 2.0–5.0 GPM operating range.

The AR20821-PKG does not include a pump — it is a standalone unloader plumbing kit designed to complete the pressure regulation and inlet plumbing side of an existing or new pressure washer system. The Mini-Matic 4/B unloader, GHA inlet adapter, stainless filter, banjo hardware, pressure adjustment knob, and chemical injection port are pre-matched for compatibility at the rated operating range. Open the kit, connect the components, and the pressure regulation side of the system is complete.

Everything in the Kit — AR20821-PKG Complete Contents

Mini-Matic 4/B Unloader. GHA Adapter. Stainless Filter. Banjo Hardware. Chemical Injection. Nothing Left to Source.

• Mini-Matic 4/B unloader valve (AR20821) — the core of the AR20821-PKG. Forged brass body for high-pressure fatigue resistance and long service life. Manually adjustable pressure knob for fine-tuning system output to surface requirements and cleaning tasks. Automatic bypass function safely redirects pump flow when the trigger gun is released — protecting the pump from dead-head pressure spikes and heat buildup. Rated for 2,600–2,800 PSI across the 2.0–5.0 GPM flow range.
• Anodized aluminum bypass and inlet housing — electrochemically hardened surface for corrosion resistance while keeping the assembly compact and lightweight for skid and cart installations. The anodized finish resists chemical exposure and surface degradation more effectively than standard aluminum in aggressive operating environments.
• Garden Hose Adapter (GHA) — fast, secure connection to standard garden hose water supplies. The GHA inlet allows the AR20821-PKG to connect directly to a residential or commercial supply line without additional fittings or thread adapters at the water source.
• Stainless steel inline filter — removes sediment, debris, and scale before they reach the Mini-Matic 4/B valve seats or the downstream pump. Cleanable and serviceable in the field. Regular inspection and cleaning maintains consistent flow and pressure at the unloader inlet across the full 2.0–5.0 GPM operating range.
• Banjo bolts with O-rings and seals — all critical plumbing joints use banjo bolt and O-ring sealing for leak-free, service-friendly connections. O-ring replacement restores full sealing integrity at low cost with standard hand tools when service is eventually required.
• Pressure adjustment knob — user-friendly manual control for dialing in working PSI. Holds consistent adjustment over long service intervals without drift or requiring re-setting between jobs.
• Chemical injection port — integrated into the AR20821-PKG assembly for drawing detergents directly into the high-pressure water stream. Connects to a standard chemical suction line for downstream detergent application.

Decoding the AR20821-PKG

What This Annovi Reverberi Unloader Package Designation Tells You

• AR20821 — Annovi Reverberi part number for the Mini-Matic 4/B unloader valve: Mini-Matic Series, no injector suffix, rated 2,600 PSI, 2.0–5.0 GPM flow range, 1/2″ F inlet, 3/8″ M outlet, anodized aluminum bypass housing
• PKG — Complete plumbing package: Mini-Matic 4/B unloader, GHA inlet adapter, stainless inline filter, banjo bolts with O-rings and seals, pressure adjustment knob, and chemical injection port — everything required for a complete unloader plumbing installation. Pump not included.

AR20821-PKG vs AR23504-PKG — Choosing the Right Unloader Package

Both are complete Annovi Reverberi unloader plumbing packages with GHA adapter, stainless filter, banjo hardware, and chemical injection port. The unloader valve and flow range drive the selection:

• AR23504-PKG — VRC-B unloader (AR23504). RC Series. 3/8″ F NPT inlet. Standard aluminum bypass housing. 2,600–2,800 PSI / up to 4.0 GPM. Compact format for tighter installations.
• AR20821-PKG (this model) — Mini-Matic 4/B unloader (AR20821). 1/2″ F inlet for higher flow capacity. Anodized aluminum bypass housing for enhanced corrosion resistance. 2,600–2,800 PSI / 2.0–5.0 GPM. The correct specification when the system flow rate may approach or exceed 4.0 GPM or when the anodized housing is preferred for the operating environment.

Key Specifications

AR20821-PKG Technical Details at a Glance

• Rated Pressure: 2,600–2,800 PSI operating range
• Flow Range: 2.0–5.0 GPM
• Unloader Valve: Mini-Matic 4/B (AR20821) — manual adjustment knob, automatic bypass
• Unloader Body: Forged brass — high-pressure fatigue resistance and long service life
• Bypass/Inlet Housing: Anodized aluminum — corrosion-resistant, lightweight, hardened surface
• Inlet Connection: 1/2″ F (female)
• Outlet Connection: 3/8″ M (male)
• Inlet Adapter: Garden Hose Adapter (GHA) — standard garden hose supply connection
• Filtration: Stainless steel inline filter — sediment, debris, and scale protection
• Hardware: Banjo bolts with O-rings and seals — leak-free, service-friendly connections
• Pressure Control: Manual adjustment knob — consistent set-point over long service intervals
• Chemical Injection: Integrated injection port — downstream detergent application
• Sealing: O-ring sealed at all critical joints
• Pump: Not included — standalone unloader plumbing kit
• Warranty: 5-year limited warranty — US-based coverage through Annovi Reverberi North America

Mini-Matic 4/B Unloader — Proven Platform Across the 2.0–5.0 GPM Range

Forged Brass Body. Anodized Housing. Manual Adjustment. Automatic Bypass. Field Serviceable.

• 1/2″ inlet for higher-flow systems — the Mini-Matic 4/B’s 1/2″ F inlet provides greater flow capacity than the 3/8″ inlet on the VRC-B platform. For systems operating at the upper end of the flow range — 4.0 GPM and above — the AR20821-PKG’s larger inlet bore supports full flow delivery without restriction at the unloader inlet.
• Anodized aluminum housing for corrosive environments — the anodized bypass and inlet housing on the AR20821-PKG provides electrochemically hardened surface protection beyond standard aluminum. For agricultural environments with fertilizer and chemical overspray, coastal installations with salt air exposure, and food processing facilities with caustic sanitation chemistry in the operating space, the anodized finish resists the surface pitting and degradation that standard aluminum accumulates over time.
• Automatic bypass at every trigger release — the Mini-Matic 4/B automatically redirects pump flow through the bypass circuit whenever the trigger gun is released. Pump output circulates continuously rather than dead-heading — preventing pressure spikes and heat buildup that shorten packing, valve, and plunger service life across contractor and fleet duty cycles.
• O-ring serviceability for minimal downtime — all critical joints in the AR20821-PKG use O-ring sealing. When O-rings require replacement, the process is fast, inexpensive, and requires only standard hand tools. AR North America stocks Mini-Matic service kits nationally. The pressure adjustment knob holds its set-point consistently over long service intervals without drift — minimizing re-adjustment between jobs or service events.

Typical Applications

Where the AR20821-PKG Delivers Best Results

• Residential and prosumer pressure washer upgrades — the AR20821-PKG provides a professional-grade Mini-Matic 4/B unloader plumbing upgrade for premium homeowner machines where the original unloader has worn or the operator requires a larger-flow, anodized-housing specification
• Contractor rigs — compact trailer and skid systems — the AR20821-PKG’s complete kit format and 2.0–5.0 GPM range covers compact contractor builds where a lighter unloader assembly and GHA supply connection support fast, clean installation
• Fleet washing — delivery vehicles, service vans, and light trucks — the Mini-Matic 4/B adjustable pressure knob, chemical injection port, and GHA inlet provide the correct combination for entry-level fleet wash bay plumbing across the 2.0–5.0 GPM range
• Agricultural rinse stations — barns, implements, and irrigation maintenance — the anodized housing provides the corrosion protection appropriate for agricultural environments where chemical overspray and high-humidity conditions accelerate standard aluminum surface degradation
• Industrial facilities — compact plant washdown and maintenance bays — complete, compatible unloader plumbing for light industrial wash stations where standardized O-ring hardware and the 2.0–5.0 GPM operating range support scheduled maintenance programs
• Rental fleet installations — turnkey unloader plumbing assemblies with long service intervals and simple O-ring maintenance between rental cycles; the stainless filter and banjo hardware minimize service complexity for rental fleet maintenance teams

5-Year US Warranty, National Parts Availability, and Wholesale Pricing

Built in Italy. Mini-Matic 4/B Platform. Complete Plumbing Kit. Backed for Five Years.

The AR20821-PKG is protected by Annovi Reverberi’s 5-year limited warranty through the US-based warranty and service network administered by AR North America. Every serviceable component — Mini-Matic 4/B O-ring service kits, stainless filter elements, banjo bolt hardware, GHA adapter, and chemical injection fittings — is stocked nationally through authorized AR North America distribution channels. Contractors, fleet operators, agricultural operations, OEM equipment builders, service technicians, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the AR20821-PKG and the complete WSHPWR pump and unloader assembly lineup. WSHPWR maintains one of the most complete Annovi Reverberi inventories available through any US web store — with thousands of products in stock and a continually expanding catalog.

2,600–2,800 PSI. 2.0–5.0 GPM. Mini-Matic 4/B Forged Brass Unloader. Anodized Housing. GHA Inlet. Stainless Filter. Banjo Hardware. Chemical Injection Port. Everything in One Kit.

Italian Engineering. Mini-Matic 4/B Complete Plumbing Package. Pump Not Included. 5-Year US Warranty.

Stop sourcing unloader plumbing components one at a time. The AR20821-PKG is the complete Annovi Reverberi Mini-Matic 4/B unloader plumbing kit for contractors, fleet operators, agricultural teams, service technicians, and OEM builders who need a fully specified, fully compatible 2,600–2,800 PSI / 2.0–5.0 GPM pressure regulation and inlet plumbing assembly in one organized box. Mini-Matic 4/B forged brass unloader. Anodized aluminum housing. GHA inlet adapter. Stainless inline filter. Banjo bolts with O-rings. Pressure adjustment knob. Chemical injection port. Five-year US warranty. Pump not included. Open the kit, connect the components, and the pressure regulation side of the system is done.

Volume buyers and wholesale accounts can reach the WSHPWR team directly at wholesale@wshpwr.com to discuss pricing across the complete Annovi Reverberi unloader and pump assembly lineup.