Restaurant 3-Compartment Sink with Dual 18" Drainboards - 90" Stainless Steel - Will Call Pickup at 11 US Warehouses
3-Compartment Commercial Sink with Dual 18-Inch Drainboards (90" Overall, 18x18x12 Bowls)
This 3-compartment commercial sink runs three full 18 by 18 by 12 inch bowls in line with an 18 inch drainboard on each end, sized for the wash-rinse-sanitize workflow that local health codes require for warewashing in most foodservice operations. Overall footprint is 90 inches wide by 24 inches deep, and 44-1/2 inches tall to the top of the rear backsplash. The entire bowl line, deck, drainboards, and backsplash are formed from one sheet of 18-gauge stainless steel, fused and polished into a single sanitary unit. Galvanized legs and adjustable ABS bullet feet keep the sink stable on uneven kitchen floors.
Both drainboards are creased and angled to direct water back into the bowl line, which keeps the deck cleaner and reduces standing water around the warewashing zone. Large radius corners both vertically and horizontally make each bowl easy to wipe down, and all exposed welds are ground smooth and polished to blend into the satin finish on the deck. The sink ships NSF listed for commercial foodservice use and carries a 90-day workmanship warranty. Faucets are sold separately. This unit may be damaged during standard freight shipping, so pickup is the recommended fulfillment method.
Will call pickup only. Available at 11 US warehouse locations: Los Angeles, San Francisco, Orlando, Chicago, Denver, Dallas, Boston, Newark, Atlanta, Houston, and Cleveland. Need this sink shipped anywhere in the US instead? Order the equivalent BK Resources 3-compartment sink with dual 18-inch drainboards (BKS-3-18-12-18T), which is built for nationwide LTL freight and includes BKDR-4 drains.
Best Use Cases for a 3-Compartment Sink with Dual Drainboards
- Manual warewashing for restaurants, bars, and cafes that do not run a dish machine
- Backup warewashing line during dish machine downtime, weekend volume, or extended service
- Pot and pan sink for kitchens that send sheet pans, hotel pans, and stockpots through a separate manual wash
- Bar back-of-house glassware wash station with sanitize bowl for shift-change reset
- Catering and concession kitchens that need a code-compliant 3-bay sink for off-site permits
- Food truck commissary warewashing where the truck does not have its own 3-bay setup
- Bakery and pastry production utensil and bowl washing
- Schools, churches, and community kitchens that handle dish duty manually
Wash-Rinse-Sanitize Workflow and Drainboard Use
The 3-bay sink is the standard manual warewashing setup recognized by most local health codes. Soiled items land on the left drainboard, get washed in the leftmost bowl with hot water and detergent, rinsed in the middle bowl with clean hot water, sanitized in the right bowl with an approved chemical sanitizer or hot water, and then air-dry on the right drainboard. The dual 18 inch drainboards on this unit give staff a dedicated soiled-side landing zone and a clean-side air-dry zone without dishes ever crossing back over the wash water.
The drainboards themselves are creased and angled, which means the deck slopes back toward the bowl line so rinse water and any debris drain into the bowls rather than pooling on the work surface or running off the front edge. This keeps the soiled-side drainboard from puddling and protects the clean-side drainboard from runoff during high-volume wash cycles.
Bowl Capacity and What Fits in 18 by 18 by 12
Each 18 by 18 by 12 inch bowl holds approximately 14 gallons of water at the rim, or about 117 pounds of water at full capacity. In practical terms each bowl will accept a full-size 18 by 26 inch sheet pan on a slight diagonal, two half-size 13 by 18 sheet pans flat, a 12 by 20 hotel pan with room to spare, stockpots up to roughly 16 inches in diameter, and standard bus tubs and gray dish boxes. The 12 inch depth gives enough clearance to fully submerge most kitchenware without water sloshing over the rear backsplash. With three bowls in line, the unit holds approximately 42 gallons of working water across the wash-rinse-sanitize cycle.
One-Piece 18-Gauge Stainless Construction
The bowls, deck, drainboards, and 9 inch rear backsplash are drawn from a single sheet of 18-gauge stainless steel. There are no welded seams along the bowl-to-deck transition, so there is no joint for grease, soap residue, or food particles to collect in. All exposed welds at the legs and corners are ground smooth and polished to match the satin finish on the deck. Vertical and horizontal corners are formed with a large radius, which makes each bowl interior easier to wipe down and meets the radius-corner requirements common in NSF and local health code reviews.
Legs, Feet, and Working Height
Legs are galvanized steel at 21-1/2 inches, which puts the deck working height at approximately 33-3/4 inches off the floor. Feet are adjustable ABS bullet feet that thread up and down for floor leveling. The 21-1/2 inch leg standard is shared across the Mix Rite multi-bowl 3-compartment line, so this sink will sit at the same deck height as adjacent compartment sinks, drainboards, and worktables of the same series. Plan adjacent worktable and drainboard heights accordingly if you want a flush deck transition.
Faucet Holes and Drain Hardware
The rear backsplash is pre-punched for a deck-mount faucet on 8 inch centers behind the bowl line. The standard configuration uses one 8-inch-center faucet positioned to swing across all three bowls, which is the typical setup for an 18 by 18 bowl pattern. Faucets are sold separately, which is standard for commercial compartment sinks because operators usually have a preferred spout length, swing radius, and pre-rinse style for the application. A swing spout faucet with at least an 18 inch reach allows a single faucet to fill all three bowls.
Drain hardware is also not included with this unit, so plan to purchase three basket strainers, lever-handle waste valves, or rotary-handle drains to match local plumbing code and the kitchen's grease management setup. Most operators specify 1-1/2 inch lever drains for a 3-bay warewashing line so each bowl can be drained independently between wash cycles.
Specifications
| Specification | Value |
|---|---|
| Model Number | MRSA-3-D |
| Configuration | 3 compartment with dual drainboards |
| Overall Length | 90 inches |
| Overall Depth | 24 inches |
| Overall Height | 44-1/2 inches (to top of backsplash) |
| Bowl Size | 18 inches L x 18 inches W x 12 inches D (each) |
| Number of Bowls | 3 |
| Drainboards | 18 inches each, left and right, creased and angled |
| Backsplash Height | 9 inches |
| Working Deck Height | Approximately 33-3/4 inches |
| Material | One-piece 18-gauge stainless steel |
| Corner Radius | Large radius vertical and horizontal |
| Welds | Ground smooth, polished to satin finish |
| Legs | Galvanized steel, 21-1/2 inches |
| Feet | Adjustable ABS bullet feet |
| Faucet Holes | Pre-punched, 8-inch centers |
| Faucet | Sold separately |
| Drain Hardware | Not included |
| Net Weight | 84 lbs |
| Certifications | NSF |
| Warranty | 90 days workmanship |
Installation and Plumbing Notes
This is a freestanding floor-mounted compartment sink, not a wall-hung unit. Position the sink with at least 6 inches of clearance behind the backsplash and adjacent to a floor sink or floor drain so each bowl waste line can air-gap to the floor sink rather than drain directly into the building waste line. An air gap is required by most local plumbing codes for any sink used to wash food contact surfaces or food product, and warewashing lines almost always require an air-gapped indirect waste connection.
Plumbing Rough-In Checklist
- Hot and cold supply lines stubbed within reach of the 8 inch faucet centers behind the bowl line
- Floor sink or hub drain located within the discharge throw of the three 1-1/2 or 2 inch waste tailpieces
- Air gap maintained between each waste tailpiece and the floor sink rim
- Backflow prevention on the supply side per local plumbing code
- Shutoff valves at each supply line for service access
- Hot water capacity sized for sustained warewashing demand on three bowls
Floor and Clearance Requirements
- Floor must be level enough that bullet-foot adjustment can compensate for variation across a 90 inch run
- Allow side clearance for elbow room and a soiled bus tub on the left, clean rack staging on the right
- Allow front clearance for a worker to stand and lean into each bowl without hitting another fixture
- Plan rear clearance for plumbing service and to keep the backsplash off finished wall surfaces
- 90 inches of usable wall length plus a few inches of side breathing room for installation
Will Call Pickup Locations
This sink is sold as will call pickup only. A 90 inch 3-bay sink is a long, awkward freight unit, and standard LTL carriers tend to bend or dent the drainboards and backsplash during transit. Rather than ship a unit that may arrive damaged, we limit fulfillment to local pickup at 11 US warehouse locations. Buyers within reasonable driving distance of any of these warehouses can pick up directly. Buyers outside that radius should order the BK Resources nationwide-shipped equivalent linked above.
11 Warehouse Pickup Cities
- Los Angeles, California
- San Francisco, California
- Orlando, Florida
- Chicago, Illinois
- Denver, Colorado
- Dallas, Texas
- Boston, Massachusetts
- Newark, New Jersey
- Atlanta, Georgia
- Houston, Texas
- Cleveland, Ohio
Need It Shipped Anywhere in the US? Order This Instead
The BK Resources BKS-3-18-12-18T 3-compartment sink with dual 18-inch drainboards is the closest direct equivalent built for nationwide LTL freight delivery. It uses the same 18 by 18 by 12 inch bowl size with dual 18 inch drainboards and lands at a similar overall footprint. The BK version steps up to T-304 stainless steel, includes BKDR-4 drain hardware, and is engineered with rounded corners and reinforced backsplash for freight handling. If you need this sink shipped to a job site, a buildout, or a city outside our 11 pickup locations, that is the one to order.
Frequently Asked Questions
What does the D in MRSA-3-D stand for?
The D indicates dual drainboards, one on each end of the bowl line. The 3 indicates a 3-compartment sink. So MRSA-3-D is a 3-bay sink with dual drainboards.
Is this sink code-compliant for manual warewashing?
Yes. A 3-bay sink with separate wash, rinse, and sanitize bowls is the standard manual warewashing configuration recognized by most local health codes. Confirm specific bowl size and drainboard requirements with the local health authority for the jurisdiction.
How is this different from MRSB-3-D?
MRSA-3-D has 18 by 18 by 12 inch bowls and 18 inch drainboards in 18-gauge stainless steel, for a 90 inch overall length and 84 lb net weight. MRSB-3-D has larger 24 by 24 by 14 inch bowls and 24 inch drainboards in 16-gauge stainless steel, for a 120 inch overall length and 161 lb net weight. Choose MRSA for standard volume and MRSB for high-volume kitchens that wash sheet pans and large stockpots.
Why is this sink will call only?
A 90 inch 3-bay stainless sink is awkward for standard LTL freight and tends to arrive bent or dented along the drainboards or backsplash. Rather than ship a unit that may arrive damaged, we limit this product to local pickup at 11 US warehouses. The BK Resources equivalent is engineered for freight and is the right choice for shipped orders.
Can I drive to a pickup location from out of state?
Yes. Buyers regularly drive to the closest warehouse, especially for 3-bay sinks where freight risk is highest. Confirm pickup hours and bring a vehicle large enough to accept a 90 inch by 24 inch crated unit, which typically requires a cargo van, box truck, or open trailer.
Are faucets and drains included?
No. Faucets are sold separately, which is standard for commercial compartment sinks. Drain hardware is also not included, so plan to purchase three basket strainers and three lever or rotary waste valves to match the application.
How many faucets do I need?
Most operators run a single swing spout faucet on 8 inch centers that reaches across all three bowls. The pre-punched faucet holes are positioned to support that setup. Operators who want a dedicated faucet per bowl can choose to add additional faucet holes, but this is uncommon for an 18 by 18 bowl pattern.
What is the working deck height?
Approximately 33-3/4 inches off the floor with the 21-1/2 inch galvanized legs and standard bullet-foot extension. Adjust the bullet feet to fine tune for floor variation across the 90 inch run.
Is this sink NSF certified?
Yes. The unit is NSF listed for commercial foodservice use and meets the radius-corner and one-piece sanitary construction requirements common in health code reviews.
What size faucet should I order?
The backsplash is pre-punched on 8 inch centers, so order a deck-mount commercial faucet with 8 inch centers and a swing spout long enough to reach across the three bowls. A 16 to 18 inch swing spout is a common starting point for a 3-bay sink with 18 inch bowls.
What gauge is the stainless steel?
18 gauge across the entire one-piece body, including the bowls, deck, drainboards, and rear backsplash. 18 gauge is the standard specification for commercial 3-compartment sinks with 18 inch bowls.
How much does the sink weigh?
Net weight is 84 pounds. Two people are required to safely move and set the sink during install. Plan for at least three people to walk a 90 inch crate through standard doorways.
What is the warranty?
90 days on workmanship. Faucets, drains, and other separately purchased components carry their own manufacturer warranties.