T-Slot .187 x .300 Foam Filled Offset Bulb Weatherstrip, Slide-In Backing

T-Slot Foam Filled Offset Bulb Weatherstrip, .187" x .300" with Slide-in Backing

This T-slot foam filled offset bulb weatherstrip is designed for use in vinyl single or double hung windows, commonly found in windows manufactured by Atrium, MI, and various other brands. The weatherstrip features a slide-in 3/16" (.187", 4.8mm) T-backing that fits into the bottom rail of the sash. When the window is closed, the bulb compresses to create an effective seal, helping to block drafts and improve energy efficiency.

The profile includes a T-slot offset bulb shape with a foam filled core and integrated fin, ensuring it conforms well to small irregularities along the sash and frame. This weatherstrip is suitable for bottom rail installations where precise fit and durable compression are needed. Please note that many T-slot weatherstrips appear very similar, often with minor differences in backing width, bulb size, or offset—carefully verify the measurements to match your original part.

Technical Information

• Profile: T-Slot, Offset Bulb
• T-Slot Width: .187" (3/16", 4.8mm)
• Bulb Type: Foam Filled, with fin
• Bulb Call Size: .300" (just under 5/16", 7.6mm)
• Actual Bulb Diameter: .275" (just under 9/32", 7.0mm)
• Bulb to T-Slot: .197" (5.0mm; 'Thin T')

Notes

• Compatible with many Atrium and MI brand vinyl windows and others.
• Product is sold by the foot and will be cut to the length specified in your order.
• Due to close similarities among T-slot weatherstrips, review all specifications and compare with your existing part before purchasing.

Please note this item is sold by the foot and will be cut to length as specified in your order. Make sure to measure your existing weatherstrip carefully, including slot width and bulb size, to ensure a proper fit before ordering. Double-check all measurements before placing your order to reduce returns and ensure compatibility.