Thermwell R338H Foam Weather Strip Tape Black 10 Ft

Product Description

The THERMWELL R338H is a high-density black foam weather-strip tape designed to seal gaps and reduce air infiltration around windows, doors, and HVAC equipment. The tape measures 0.375 inches wide by 0.1875 inches thick and comes in a 10-foot roll. Its self-adhesive backing allows for fast, clean installation without additional fasteners or adhesives. The compressible foam construction conforms to irregular surfaces, making it effective in residential and light commercial applications where consistent sealing pressure matters. HVAC technicians, appliance service pros, and general contractors reach for this tape when a reliable compression seal is needed on the job.

This tape is suited for a wide range of sealing and vibration-dampening tasks. Common applications include sealing gaps around window and door frames, creating a gasket seal around room air conditioners, and replacing or supplementing refrigerator and freezer door gaskets. The foam also works as a vibration isolator to reduce rattles and squeaks on vehicles, equipment panels, and cabinet assemblies. Its high-density foam construction holds up under repeated compression without permanently deforming, maintaining the seal over time.

Key Features

• High-density black foam resists permanent compression for a lasting seal
• Self-stick backing bonds quickly to clean, dry surfaces without extra adhesive
• Compressible profile fills irregular gaps on windows and door frames
• Suitable as a gasket seal around room air conditioners and refrigerator or freezer doors
• Reduces rattles, squeaks, and vibrations on vehicle panels and equipment housings
• 10-foot roll provides sufficient length for most single-opening applications

Compatibility

Designed as a general-purpose compression seal tape suitable for windows, doors, room air conditioner installations, refrigerator and freezer door perimeters, and vehicle or equipment vibration isolation applications.

Installation Notes

Clean and dry the mounting surface thoroughly before applying the tape to ensure full adhesion. Remove the backing liner gradually as you press the tape into position, avoiding stretching the foam. Power down any HVAC or appliance equipment before working around electrical components or refrigerant-containing assemblies. No special tools are required, but a sharp utility knife or scissors are recommended for clean cuts at corners and joints.