John C. Ernst Co, Inc.
John C. Ernst Co, Inc.
21 Gail Court
Sparta, NJ 07871-3438
USA

Toll Free: 888.943.5000
Phone: 973.940.1600
Fax: 973.940.1620
Email: sales@johnernst.com
Website: www.johnernst.com
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  • Wafer Flange (Fits Between Two 150 Lb ASME Flanges)
  • Full Protective Shield Around Inner Glass Tube
S21 Series Full View Flanged Plastic Sight Flow Indicators
Unit of Measure
1 

Model #

Size

Pressure Rating

Material

Length

S21F-GX-15G-C N/A 1-1/2 in N/A 110 PSIG @ 180 ºF 150 PSIG @ 75 ºF N/A Polypropylene/Fluorocarbon (FKM) N/A 4.500 in
S21F-GX-20G-C N/A 2 in N/A 110 PSIG @ 180 ºF 150 PSIG @ 75 ºF N/A Polypropylene/Fluorocarbon (FKM) N/A 5.00 in
S21F-GX-30G-C N/A 3 in N/A 90 PSIG @ 180 ºF 110 PSIG @ 75 ºF N/A Polypropylene/Fluorocarbon (FKM) N/A 5.25 in
S21F-GX-40G-C N/A 4 in N/A 90 PSIG @ 180 ºF 110 PSIG @ 75 ºF N/A Polypropylene/Fluorocarbon (FKM) N/A 5.63 in
S21F-GX-60G-C N/A 6 in N/A 55 PSIG @ 180 ºF 70 PSIG @ 75 ºF N/A Polypropylene/Fluorocarbon (FKM) N/A 6.13 in
S21F-GX-80G-C N/A 8 in N/A 30 PSIG @ 180 ºF 45 PSIG @ 75 ºF N/A Polypropylene/Fluorocarbon (FKM) N/A 6.25 in
S21F-HX-15G-C N/A 1-1/2 in N/A 110 PSIG @ 140 ºF 140 PSIG @ 75 ºF N/A PVC/Fluorocarbon (FKM) N/A 4.500 in
S21F-HX-20G-C N/A 2 in N/A 110 PSIG @ 140 ºF 140 PSIG @ 75 ºF N/A PVC/Fluorocarbon (FKM) N/A 5.00 in
S21F-HX-30G-C N/A 3 in N/A 110 PSIG @ 75 ºF 90 PSIG @ 140 ºF N/A PVC/Fluorocarbon (FKM) N/A 5.25 in
S21F-HX-40G-C N/A 4 in N/A 110 PSIG @ 75 ºF 90 PSIG @ 140 ºF N/A PVC/Fluorocarbon (FKM) N/A 5.63 in
S21F-HX-60G-C N/A 6 in N/A 70 PSIG @ 75 ºF 60 PSIG @ 140 ºF N/A PVC/Fluorocarbon (FKM) N/A 6.13 in
S21F-HX-80G-C N/A 8 in N/A 45 PSIG @ 75 ºF 35 PSIG @ 140 ºF N/A PVC/Fluorocarbon (FKM) N/A 6.25 in
S21F-KX-15G-C N/A 1-1/2 in N/A 120 PSIG @ 75 ºF 60 PSIG @ 225 ºF N/A PTFE/Fluorocarbon (FKM) N/A 4.500 in
S21F-KX-20G-C N/A 2 in N/A 120 PSIG @ 75 ºF 60 PSIG @ 225 ºF N/A PTFE/Fluorocarbon (FKM) N/A 5.00 in
S21F-KX-30G-C N/A 3 in N/A 100 PSIG @ 75 ºF 50 PSIG @ 225 ºF N/A PTFE/Fluorocarbon (FKM) N/A 5.25 in
S21F-KX-40G-C N/A 4 in N/A 100 PSIG @ 75 ºF 50 PSIG @ 225 ºF N/A PTFE/Fluorocarbon (FKM) N/A 5.63 in
S21F-KX-60G-C N/A 6 in N/A 70 PSIG @ 75 ºF 30 PSIG @ 225 ºF N/A PTFE/Fluorocarbon (FKM) N/A 6.13 in
S21F-KX-80G-C N/A 8 in N/A 45 PSIG @ 75 ºF 10 PSIG @ 225 ºF N/A PTFE/Fluorocarbon (FKM) N/A 6.25 in
S21F-JX-15G-C N/A 1-1/2 in N/A 110 PSIG @ 180 ºF 150 PSIG @ 75 ºF N/A CPVC/Fluorocarbon (FKM) N/A 4.500 in
S21F-JX-20G-C N/A 2 in N/A 110 PSIG @ 180 ºF 150 PSIG @ 75 ºF N/A CPVC/Fluorocarbon (FKM) N/A 5.00 in
S21F-JX-30G-C N/A 3 in N/A 90 PSIG @ 180 ºF 110 PSIG @ 75 ºF N/A CPVC/Fluorocarbon (FKM) N/A 5.25 in
S21F-JX-40G-C N/A 4 in N/A 90 PSIG @ 180 ºF 110 PSIG @ 75 ºF N/A CPVC/Fluorocarbon (FKM) N/A 5.63 in
S21F-JX-60G-C N/A 6 in N/A 55 PSIG @ 180 ºF 70 PSIG @ 75 ºF N/A CPVC/Fluorocarbon (FKM) N/A 6.13 in
S21F-JX-80G-C N/A 8 in N/A 30 PSIG @ 180 ºF 45 PSIG @ 75 ºF N/A CPVC/Fluorocarbon (FKM) N/A 6.25 in
S21F-LX-15G-C N/A 1-1/2 in N/A 120 PSIG @ 75 ºF 35 PSIG @ 290 ºF N/A Kynar® (PVDF)/Fluorocarbon (FKM) N/A 4.500 in
S21F-LX-20G-C N/A 2 in N/A 120 PSIG @ 75 ºF 35 PSIG @ 290 ºF N/A Kynar® (PVDF)/Fluorocarbon (FKM) N/A 5.00 in
S21F-LX-30G-C N/A 3 in N/A 100 PSIG @ 75 ºF 25 PSIG @ 290 ºF N/A Kynar® (PVDF)/Fluorocarbon (FKM) N/A 5.25 in
S21F-LX-40G-C N/A 4 in N/A 100 PSIG @ 75 ºF 25 PSIG @ 290 ºF N/A Kynar® (PVDF)/Fluorocarbon (FKM) N/A 5.63 in
S21F-LX-60G-C N/A 6 in N/A 70 PSIG @ 75 ºF 15 PSIG @ 290 ºF N/A Kynar® (PVDF)/Fluorocarbon (FKM) N/A 6.13 in
S21F-LX-80G-C N/A 8 in N/A 45 PSIG @ 75 ºF 8 PSIG @ 290 ºF N/A Kynar® (PVDF)/Fluorocarbon (FKM) N/A 6.25 in
Unit of Measure
1