Description
The header vent plug is used to release low pressure build-
up that may occur in a closed system utilizing selector
valves or check valves. The header vent plug should also
be installed on the cylinder sides of the check valves on
both main and reserve systems to relieve any pressure that
may leak past the check valve and accidentally actuate the
reserve system while the main system is discharging.
System Components
UL EX-4510 2-1-12 Page 1-14
REV. 3
Header Vent Plug
Shipping Assembly
Part No. Description
40309 Header vent plug
Component Material Thread Size/Type Approvals
Vent Plug Body: 1/2 in. NPT Male UL Listed (EX-4510);
Brass Listed for use with FM Approved systems
Spring:
Bronze
Seal:
Neoprene
SPRING
CHECK SEAL
CHECK CUP
1/2 IN. NPT
000707
STEM
BODY
WASHER
29/32 IN.
(23 mm)
7/8 IN.
(22 mm)
ANSUL
®
Copyright © 2012 Tyco Fire Products LP.
All rights reserved.
Form No. F-9334-05
One Stanton Street +1-715-735-7411
Marinette, WI 54143-2542 www.ansul.com
CAUTION
A header vent plug must be installed in all closed sec-
tions of the system manifold(s). The omission of a head-
er vent plug may cause the manifold to build pressure.
This could result in the actuation of a system cylinder,
which would then cause all cylinders in that specific sys-
tem to actuate.
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