The Reliable Automatic Sprinkler Co., Inc.,
103 Fairview Park Drive, Elmsford, New York 10523
Bulletin 161
Rev
.
C
Bulletin 161
Rev.
C
Model G4-300
300 psi (20,7 bar) Rated
Concealed Automatic
Sprinkler
The G4-300 Concealer
®
A Concealed Sprinkler With a
½” (13mm) or 1½” (38mm)
Adjustment
Features
1. Cover plate attachment (Plain or Per-
forated) with ½” (13mm) cover plate
adjustment.
2. Simple sturdy cover attachment.
3. Smooth aesthetic ceiling profile.
4. Factory installed protective cap.
5. Available in brass, chrome or black
plated and white painted finishes.
6. Ordinary and intermediate tempera-
ture rating.
7. 300 psi (20,7 bar) maximum pressure
rating.
Listings and Approvals
1. Underwriters Laboratories, Inc.
2. Certified for Canada by Underwriters Laboratories
Inc.
3. NYC MEA 258-93-E
Note:
Approvals are for Light and Ordinary Hazard. The
cup and skirt are fabricated from plated steel and are
recommended for interior, non-corrosive applications.
U.S. Patent Number 4,800,063.
The Model G4-300 Concealer
®
is designed for use where
aesthetic appearance is important. It can be used at work-
ing pressures up to 300 psi (20,7 bar). The Model G4-300
Concealer
®
is a UL Listed Standard Response Concealed
sprinkler intended for use in accordance with NFPA 13.
Product Description
The Reliable Model G4-300 Concealer
®
uses the proven
Model G fusible element in a standard style sprinkler frame
with a drop down deflector. This assembly is recessed into
the ceiling and concealed by a flat cover plate. The cover
plate and sprinkler cup assemblies are attached using a
strong threaded engagement. This threaded engagement
provides ½” (13mm) of cover adjustment. The cover plate
is attached to the skirt using an ordinary temperature clas-
sification solder. This result in strong cover plate assembly
with an ordinary temperature rating, and an intermediate
temperature sprinkler which can be installed in 150°F (66°C)
environments. When the temperature at the ceiling rises, the
solder holding the cover plate fuses, allowing the release of
this part and thus exposing the sprinkler inside to the rising
ambient temperature.
Application
The Reliable Model G4-300
Concealer
®
is a versatile stan-
dard response concealed
sprinkler. It provides the best
form of fire protection while
offering an attractive appear-
ance and ½” (13mm) of cover
adjustment for ease of installation. The small diameter cover
plate is easily and positively attached and blends into the
ceiling, concealing dependable fire protection; an automatic
sprinkler system.
