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Single Tapped
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 bronze 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.