QB Series · Qwik Tees and Qwik Ells Flexible Fitting

Fernco QB-43 Flexible PVC Bushing

Part # QB-43

Unmatched quality and performance. Engineered for lasting durability in plumbing, sewer, and drain applications, Fernco couplings offer a robust,...
Flexible fit. Adapts 4" Fernco flexible tees and elbows to accept 3" connections.
Flexible elastomeric PVC. Maintains system flexibility while resisting cracking, shrinking, and environmental wear.
Specs and codes. Complies with ASTM d 5926

QB Series Size: 4" x 3"

Connects Cast Iron, Plastic and Steel

Drawing (PDF) All documents

Dimensions

Download drawing (PDF)

End 1 pipe OD range	3.05" to 3.05"
End 2 pipe OD range	3.45" to 3.45"
End 1 inside diameter	3.05"
End 2 inside diameter	3.45"
Length	4.52 in
Width	4.52 in
Height	1.70 in
Weight	0.5 lb

Product details

The Fernco QB-43 qwik reducing bushing is specifically designed to reduce a 4" opening down to 3" only within Fernco flexible tees and elbows. Made from durable elastomeric PVC, the QB-43 maintains the flexibility and sealing characteristics of the flexible fitting while enabling a smooth and reliable size transition. Perfect for drain, waste, and vent systems during retrofits or service jobs, the QB-43 supports dependable performance without rigid or complex adapters.

American craftmanship. With over 60 years of proud manufacturing in the USA, Fernco's products reflect unparalleled quality and reliability, underpinned by decades of industry expertise.

Specifications

Product
Connection	Compression
Fitting type	Bushing
Flexible	Yes
Material	Elastomeric PVC
Color	Black
Standards	ASTM D5926, UPC
Application	Above Ground, DWV

Performance
Max test pressure	4.3 psi
Temperature range	-30°F to 140°F

Drawings and downloads

Documents

Dimensional drawing

QB-43, PDF · 16.73 KB

Download

Directional Fitting Sell Sheet PDF · 961.47 KB
Qwik Tee and Ell Installation PDF · 2.61 MB
Installation instructions All products

Compare QB Series sizes

Cast Iron, Plastic and Steel

QB-150/125

Size
1.5" x 1.25"

Pipe OD range
1.36" to 1.36" / 1.60" to 1.60"
QB-215

Size
2" x 1.5"

Pipe OD range
1.60" to 1.60" / 1.90" to 1.90"
QB-32

Size
3" x 2"

Pipe OD range
2.05" to 2.05" / 2.30" to 2.30"
QB-43 (this part)

Size
4" x 3"

Pipe OD range
3.05" to 3.05" / 3.45" to 3.45"

Part	Size	Pipe OD range (end 1 / end 2)
QB-150/125	1.5" x 1.25"	1.36" to 1.36" / 1.60" to 1.60"
QB-215	2" x 1.5"	1.60" to 1.60" / 1.90" to 1.90"
QB-32	3" x 2"	2.05" to 2.05" / 2.30" to 2.30"
QB-43 (this part)	4" x 3"	3.05" to 3.05" / 3.45" to 3.45"