Each Valve is in brand new condition, never used, never installed.

Some units will have the nut attached, others will not.

All are original, OEM from Aprilaire.

Most will not have original packaging.

For AprilAire Whole House Humidifier Models 400, 400M, 500, 500M, 600, 600M, 558, 550A, 550, 568, 560A, 560, 700, 700M, 768, 760A, 760

All sales ship through USPS Ground Advantage - USPS Priority Mail Or UPS Ground

-Each item ships out the same or next business day.

-Experienced eBay seller since 2006. Buy with confidence.

-Each item has unique identifiers and/or serial numbers recorded to combat any fraudulent return.