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Single Tapped
Part No.
Size
Inlet
Outlet
Weight lbs
521SB
550SB
551SB
552SB
522SB
553SB
554SB
555SB
523SB
556SB
557SB
558SB
524SB
559SB
560SB
561SB
525SB
562SB
563SB
564SB
526SB
527SB
528SB
3/4
3/4
3/4
3/4
1
1
1
1
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
2
2
2
2
2 1/2
3
4
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/8
1/8
-
-
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/4
-
-
1/8
1/4
-
-
-
.80
.80
.80
.80
1.2
1.2
1.2
1.1
1.7
1.7
1.7
1.7
2
2
2
2
3.7
3.7
3.7
9.8
10.1
23.5
All Simmons stainless steel check valves are CERTIFIED LEAD FREE and include Buna-N O-Ring, stainless steel spring, stainless steel washer, and stainless steel locknut. All valves ¾” through 1 ½” have a working pressure of 400 PSI, while valves 2” and larger have a working pressure of 600 PSI. Check valves rated for 190°F maximum temperature.