11.5" X 11.5" X 7" Plastic Tub Box, Air Powered Drain Clearing Tools, Rough Plumbing

Product Overview

The IPS 83301 Tub Box is a professional-grade plastic form designed for use in slab foundation installations to provide access for tub traps and drain assemblies. This 11.5" x 11.5" x 7" deep form creates a recessed cavity for plumbing connections during the rough-in phase. The box is positioned over the drain rough prior to slab pour, and once the concrete has set, the base is cut out to expose the trap area for final tub installation. Engineered for durability and dimensional stability, the IPS 83301 ensures precise alignment and adequate working space for drain and vent connections in residential and commercial construction.

Technical Specifications

• Manufacturer: IPS Corporation
• Model Number: 83301
• Description: Tub Box Form for Slab Foundation Drain Access
• Reference Number: 1937353
• Nominal Dimensions: 11.5 in x 11.5 in x 7 in (292 mm x 292 mm x 178 mm)
• Depth: 7 in (178 mm)
• Material: High-impact molded plastic (polyethylene or equivalent)
• Color: Black
• Wall Thickness: Uniform heavy-duty structural form designed to withstand concrete pressure during pour
• Installation Method:
  • Invert the box over the drain rough before slab pour
  • Secure in place to maintain location and elevation
  • Pour slab and allow to cure
  • Cut out the bottom of the box to expose the trap and drain assembly before final tub placement
• Application:
  • Forms an accessible cavity for bathtub traps and drain connections in concrete slab installations
  • Used in residential, multi-family, and light commercial construction
  • Ensures proper clearance for future service and inspection
• Performance Characteristics:
  • Maintains shape and location under concrete pour pressures
  • Prevents encasement of drain piping in concrete
  • Provides adequate working clearance for trap, waste, and overflow fittings
• Temperature Range: -20°F to 140°F (-29°C to 60°C)
• Corrosion Resistance: Resistant to concrete alkalinity and moisture exposure
• Compatibility: Suitable for PVC, ABS, or cast-iron drain systems
• Compliance and Standards:
  • Conforms to applicable ASTM D1784 material classification for rigid thermoplastic construction
  • Meets standard plumbing code requirements for under-slab access provisions
• Maintenance: No ongoing maintenance required post-installation
• Operating Environment: Intended for embedded use in concrete slab foundations
• Packaging: Supplied as a single molded unit
• Country of Manufacture: United States

Summary

The IPS 83301 Tub Box is an 11.5" x 11.5" x 7" molded plastic form used to create an accessible cavity for tub traps and drain assemblies in slab foundation construction. Built to withstand the pressure of concrete placement and maintain trap alignment, it provides a reliable and efficient solution for rough-in plumbing access in professional-grade installations.