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.

20381 Redi Vent Air Admittance Valve With Recessed Box Grill

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Description

🚿 Elevate your plumbing game—vent smart, install sleek, and never compromise on style!

SLEEK CONCEALMENT - Snap-on grill and recessed box hide the valve neatly while maintaining easy access, blending perfectly with modern interiors.
SEAMLESS INTEGRATION - One-piece design with built-in mounting flange means no extra framing or support needed—install like a pro, stress-free.
COMPACT CLEAN FINISH - Low-profile white box (6.625" x 8") offers a minimalist look that complements any space, avoiding bulky vent pipes and roof penetrations.
UNIVERSAL COMPATIBILITY - Connects effortlessly to standard 1-1/2" or 2" ABS or PVC piping, fitting right into your existing setup without hassle.
CODE READY ACCESSIBILITY - Designed to meet local code requirements with accessible design and an industry-first integral test cap for easy maintenance.

The Studor 20381 Redi-Vent Air Admittance Valve with Recessed Box and Grill is a cutting-edge plumbing solution that simplifies drainage venting by eliminating the need for roof penetrations. Its one-piece construction with built-in mounting flange ensures quick, no-fuss installation into 1.5" or 2" ABS/PVC pipes. The included recessed box and snap-on grill provide a clean, professional finish while maintaining code-required accessibility. Featuring an industry-first integral test cap, this compact, white vent system is perfect for modern interiors seeking efficient, concealed ventilation.

Reviews

C**N

31.03.2026

C**G

9.02.2026

J**O

6.04.2026

R**U

7.04.2026

R**S

16.02.2024

M**K

13.03.2015

S**E

5.08.2016

W**G

31.05.2024

C**N

10.04.2023

A**R

16.09.2018

A**R

24.01.2019

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TrustScore 4.5 | 7,300+ reviews

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ASIN	B00FQEX7DM
Best Sellers Rank	#79,124 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #519 in Registers, Grilles & Vents
Date First Available	October 3, 2013
Is Discontinued By Manufacturer	No
Item Weight	5.6 ounces
Item model number	20381
Manufacturer	IPS Corporation
Product Dimensions	4.25 x 4.25 x 7.2 inches

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

Description

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