can pipe dope be used or Teflon fkr threads?

Can be used but not recommended and not needed. This is just a vent to allow water to drain.

Can this be used outdoor?

[I'm not a plumber.] But, I don't see why it couldn't be used outside. The seals might be more prone to wear if exposed to the weather.

What is the dfu rating?

From their website: “174020 - 2" Dual-Seal 20 AAV maximum DFU rating Individual and Branch 10 DFU, Stack 12 DFU”

can you just screw it on or is teflon tape required to seal the pipe threads?

a little tape never hurts but not necessary.

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🛠️ Seal the deal with TUUBER: Twice the protection, zero the stink!

WHISPER QUIET VENTING - Advanced flow attenuation ensures silent valve operation, so your plumbing stays discreet and disturbance-free.
PLUG PLAY PRECISION FIT - 2-inch NPT threads engineered for seamless integration with standard schedule 40 pipes—no guesswork, just perfect fit.
VERSATILE VENTING SOLUTION - Ideal for branch, stack, pump waste, and sewer ejector systems—upgrade any setup with confidence.
BUILT TO LAST WITH WARRANTY - Crafted from durable PVC and backed by a limited lifetime warranty, this valve is a long-term investment in peace of mind.
DOUBLE THE SEAL ZERO THE SMELL - Patented dual-seal design blocks sewer gases twice as effectively, keeping your space fresh and safe.

The TUUBER 2-inch Vent Tuuber Air Admittance Valve features patented dual sealing technology that provides twice the sealing capability to prevent sewer gas escape. Designed with 2-inch NPT threads for easy installation on schedule 40 pipes, it offers quiet, reliable venting for branch, stack, and pump waste systems. Made from durable PVC and compliant with ASSE 1050/1051 standards, it comes with a limited lifetime warranty, ensuring long-lasting performance and peace of mind.

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€ 102.82

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Material	PVC
Brand	TUUBER
Item dimensions L x W x H	7.6 x 7.6 x 7.1 Centimeters
Inlet Connection Size	2 Inches
Inlet Connection Type	Flange
Outlet Connection Type	MNPT
Number of Ports	2
Outlet Connection Size	2 Inches
Specification Met	ASSE
Manufacturer	TUUBER
UPC	860001022933
Country of Origin	USA
Item model number	H2-020-AAV
Product Dimensions	7.62 x 7.62 x 7.11 cm; 82 g
ASIN	B07YXGF834

2-inch Vent Tuuber 2X Superior Seal Air Admittance Valve

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