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Reliable Automatic Sprinkler Co., Inc.,

 

103 Fairview Park Drive, Elmsford, New York 10523

Bulle

tin 051 F

ebruary 2021

Bulletin 051 February 2021

Model G5-56 Dry (SIN RA5114)
K5.6 (80 metric)
Concealed Dry Pendent 
Sprinkler

UL Quick Response
FM Standard Response
½” (13mm)  Cover plate Adjustment
Features

1. Flat cover plate with threaded attachment.
2. Cover plate available in chrome and white as Stan-

dard Finishes.
Also available in a wide variety of Special Ap-
plication Finishes.

3. Cover plates with gaskets are available to limit

dust and air movement through the ceiling.

4. Available in Ordinary or Intermediate temperature rat-

ing.

5. Sprinkler available in lengths from 4

¼

 inches (108mm) 

to 48 inches (1219mm) in 

¼-

inch (6.35mm) incre-

ments (see Fig. 1).

Approvals & Listings

1.

Listed by Underwriters Laboratories and Certified for Can

-

ada (cULus) as a Quick-response sprinkler for Light and
Ordinary Hazard occupancies. UL Guide Number VNIV,
Sprinklers, Automatic and Open.

2. FM Approved as a Standard-response sprinkler.

Patents

The Model G5-56 Dry is covered by the following patents:
U.S. 5,775,431
U.S. 5,967,240

Application 

The Model G5-56 Dry is a cULus Listed Quick Response Con-

cealed Dry Pendent sprinkler intended for use in accordance 
with NFPA 13. The Model G5-56 Dry sprinkler is cULus Listed 
for use in Light and Ordinary Hazard occupancies.

The Model G5-56 Dry is FM Approved as a Standard Re-

sponse Concealed Dry Pendent sprinkler intended for use in ac-
cordance with FM Loss Prevention Data Sheet 2.0.

Product Description 

The Reliable Model G5-56 Dry sprinkler is a Dry Pendent sprin-

kler, where the sealing washer is located at the inlet end of the sprin-
kler assembly. The position of the sealing washer is controlled by a 
fusible element at the opposite end of the sprinkler assembly. The 
sprinkler is installed with the fusible element at the ceiling of a pro-
tected space that may be subject to freezing temperatures and the 

inlet orifice located in a heated area above the ceiling. Operation of 

the fusible element allows the sealing washer to move out of the inlet 

orifice admitting water from the supply piping. The sprinkler uses 

a fast-response fusible element with an Ordinary, 165°F (74°C), or 

Intermediate, 212°F (100°C), temperature classification.

The Model G5-56 Dry sprinkler has a dropdown deflector design 

that allows the sprinkler to be recessed into the ceiling and con-
cealed by a flat cover plate. The cover plate assembly threads into 
the sprinkler’s cup and provides ½-inch (13mm) of cover adjust-
ment. The cover plate assembly consists of a flat cover plate that 
is attached to the skirt using either 135°F (57°C) or 165°F (74°C) 
temperature rated solder. The 135°F (57°C) cover plates are for use 

with  Ordinary  temperature  classification  sprinklers  and  the  165° 

(74°C) cover plates are for use with Intermediate temperature clas-

sification sprinklers.

The Model G5-56 Dry sprinkler is available in lengths ranging from 

4¼ inches (108mm) to 48 inches (1219mm) in ¼-inch (6.35mm) 
increments (see Fig. 1). The length of the sprinkler must be selected 
to provide the Exposed Minimum Barrel Length in a Heated Area 
required by Fig. 2.

The Model G5-56 Dry sprinkler is available with 1-inch NPT or 

ISO 7-1 R1 threaded inlet fittings. The standard inlet fitting includes 

a long inlet designed to minimize the potential for water, scale, and 
sediment to accumulate on the sprinkler inlet in wet- and dry-pipe 
sprinkler systems. For wet-pipe sprinkler system applications where 
the standard inlet interferes with installation into existing plastic pipe 

fittings, an inlet fitting is available with a short (“PL”) inlet. See Fig. 3 

for further information.

Model G5-56 Dry Sprinkler

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