3M 7000148881 Fire Barrier Cast-in Tub Box Assembly

Product Description

The 3M 7000148881 is a fire barrier cast-in tub box assembly designed to create a void on the top surface of a concrete slab for plumbing access. It fastens directly to a 2-inch 3M Fire Barrier Cast-In Device for Metallic Pipes. After the slab is cured, the 3-inch foam insert is removed to produce a void 3 inches deep. The assembly accommodates concrete slabs as thin as 4.5 inches and supports pipe sizes from 1.5 inches to 2 inches. Licensed plumbers and fire-stop contractors install this assembly as part of a code-compliant penetration firestop system in concrete floor construction.

This assembly is intended for use in residential and commercial concrete slab construction where plumbing penetrations require a pre-formed access void. It is specifically paired with the 2-inch 3M Fire Barrier Cast-In Device for Metallic Penetrations. When the tub box assembly and cast-in device are used together, the system can accommodate certain non-metallic penetrants in addition to metallic pipe — consult system details for a list of approved penetrants. This product is sold individually and is suited for new poured-concrete floor installations.

Key Features

• Creates a 3-inch deep void in cured concrete slabs for plumbing access
• Compatible with concrete slab thickness as thin as 4.5 inches
• Supports metallic pipe sizes from 1.5 inches to 2 inches
• Foam insert is removed after slab cure to form the finished void
• Fastens directly to the 2-inch 3M Fire Barrier Cast-In Device for Metallic Pipes
• May allow approved non-metallic penetrants when used with the paired cast-in device — verify with system approval documentation

Compatibility

Designed for use specifically with the 2-inch 3M Fire Barrier Cast-In Device for Metallic Penetrations. The assembly accommodates pipe sizes from 1.5 inches to 2 inches in concrete slabs no thinner than 4.5 inches. See 3M system details for the full list of approved penetrant types.

Installation Notes

Installation is performed by licensed plumbers or certified firestop contractors during concrete forming, prior to the slab pour. The tub box assembly must be secured to the cast-in device before concrete is placed. Remove the foam insert only after the concrete has fully cured. Follow applicable building codes and the manufacturer system approval documentation for penetrant type and firestop configuration requirements.

Technical Specifications

• Foam Insert Depth: 3 inches
• Compatible Pipe Size Range: 1.5 inches to 2 inches
• Minimum Slab Thickness: 4.5 inches
• Paired Device Pipe Size: 2 inches
• Weight: 1.42 pounds
• UPC: 00051115165863

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000148881