can it be use in 2x3 stud wall

It is 2 3/4" from the back of the enclosure to the back of the drywall flange. So the answer would no. You could flange it out if you had to make it work.

what is the diameter of the bottom hole of the recessed box? 1.5” or 2” and is it threaded?

Both, 2&1.5”, 2” pipe slips over the connector and 1.5 slides inside of the connector of the box. No threads, it is for solvent connections.

does this come WITH the air admittance valve as shown in the picture? is that for 1 1/2 drain vent, or 2"?

Mine came with everything shown; air admitance valve, mounting box, and the cover plate. Was a 2” kit as it was what I needed.

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Studor 20381 Redi-Vent Air Admittance Valve with Recessed Box and Grill

Studor 20381 Redi-Vent Air Admittance Valve with Recessed Box and Grill

Product ID: 11548688

📏Fits 1.5" or 2" ABS/PVC piping

⚙️One-piece construction with built-in flange

🛠️Snap-on grill for easy access & code compliance

₨1705

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Description

🚀 Elevate your plumbing game with Studor’s sleek, code-smart Redi-Vent!

UNIVERSAL FIT - Compatible with both 1-1/2" and 2" ABS or PVC piping for versatile plumbing solutions.
TRUSTED PERFORMANCE - Highly rated with 4.7 stars from 436 users—join the pros who rely on Studor quality.
DISCREET COMPLIANT - Snap-on grill conceals the valve while ensuring easy access and meeting all code requirements.
SEAMLESS INSTALLATION - Built-in mounting flange means no extra framing—save time and hassle in your next project.
COMPACT CLEAN DESIGN - Sleek white recessed box (6-5/8" x 8") blends effortlessly into modern interiors.

The Studor 20381 Redi-Vent Air Admittance Valve with Recessed Box and Grill offers a streamlined, one-piece design that fits standard 1.5" or 2" ABS/PVC pipes. Its built-in mounting flange eliminates the need for extra framing, while the snap-on grill ensures code compliance and easy access. Compact and discreet, this white valve assembly is a trusted choice for professional-grade plumbing installations.

Specifications

ASIN	B00FQEX7DM
Best Sellers Rank	#58,113 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #348 in Registers, Grilles & Vents
Color	White
Customer Reviews	4.7 4.7 out of 5 stars (436)
Date First Available	October 3, 2013
Included Components	Redi-Vent Air Admittance Valve with Recessed Box and Grill
Item Package Quantity	1
Item Weight	5.6 ounces
Item model number	20381
Manufacturer	IPS Corporation
Part Number	20381
Pattern	Valve
Product Dimensions	4.25 x 4.25 x 7.2 inches
Size	Redi-Vent, Box, and Grill
Style	Redi-Vent AAV + Recessed Box

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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