John Boos GT-8 Carbon Steel Grease Interceptor - 8 lb Capacity

In this review the John Boos GT-8 Carbon Steel Grease Interceptor is evaluated for small commercial kitchens and back-of-house prep stations that need a compact, rugged solution for separating fat, oil and grease from drainage water. The bottom line: this model is best for operations that require a certified, TIG welded carbon steel unit with a secure locking cover and simple maintenance access, and the single biggest reason to buy is its heavy-gauge construction combined with a removable baffle that makes cleaning straightforward.

Key Features

• 8 lb grease capacity: Sized for light to moderate grease loads, the 8 lb capacity keeps grease isolated before it reaches plumbing lines.
• Durable carbon steel construction: Built from TIG welded 11 gauge (1/8 in) carbon steel with a corrosion resistant coating for strength in a commercial environment.
• Secure non skid cover: The deck plate has a locking device to keep the lid closed during service and to reduce accidental access.
• Removable baffle: The baffle comes out for easier maintenance and cleaning, reducing downtime between service cycles.
• Included T-Vent flow control tee: The supplied flow control tee helps regulate flow and is included so no separate part is required for installation.
• No-hub adapter compatibility: Both ends accept no-hub adapters for steel or plastic connections, simplifying plumbing tie-in.

Who It's For

The GT-8 suits small restaurants, food trucks with a fixed prep area, cafes and catering kitchens that need a compact, commercial-grade interceptor certified by the Plumbing and Drainage Institute. Its modest footprint and 8 lb capacity make it appropriate where space is limited and grease output is moderate.

Those who should look elsewhere include larger full-service kitchens or operations with heavy frying and high grease volume; facilities with greater grease loads should choose a larger capacity model in the same line. If long-term corrosion resistance in very wet locations is a top concern, verify local installation conditions and maintenance frequency before purchase.

Pros & Cons

Pros

• Robust TIG welded 11 gauge steel construction provides strong, commercial-grade durability.
• Non skid, lockable cover and removable baffle make maintenance safer and more convenient.
• Includes T-Vent flow control tee and accepts no-hub adapters for flexible plumbing connections.

Cons

• Size and 8 lb capacity may be small for high-volume kitchens; some users report the clean side feels limited.
• There are customer notes about corrosion and leakage over time, so regular inspection and maintenance are important.

Specifications

Brand	John Boos
Model Capacity	8 lb grease capacity
Dimensions (L x H x W)	14.2 in x 11.2 in x 10.5 in
Material	TIG welded 11 gauge (1/8 in) carbon steel with corrosion resistant coating
Cover	Non skid deck plate with locking device
Flow Control	T-Vent Pipe (Flow Control Tee) included
Connection	Both ends accept no-hub adapters for steel or plastic

Our Verdict

The John Boos GT-8 is a compact, well-built grease interceptor that offers commercial welding, a lockable non skid lid and an included flow control tee, making it a practical choice for small to medium kitchens that need a certified, serviceable unit. It represents good value when sized correctly, but buyers should plan routine maintenance and consider a larger model if grease output is high.

Frequently Asked Questions

Is the GT-8 certified?
The unit is certified by the Plumbing and Drainage Institute.

What fittings are required to install?
Both ends accept no-hub adapters for steel or plastic, and a T-Vent Flow Control Tee is included.

How is maintenance handled?
Maintenance is simplified by the removable baffle and lockable non skid cover, but regular inspection is recommended to prevent corrosion and leakage.