Sounding Tubes are designed to provide a watertight closing device, which is accessible under normal operating conditions to enable sounding of the tanks.

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Item #

Plug Thread

Dimension A

Dimension B

Dimension C

Dimension D

Approximate Weight

Hole Length

1.5-ST N/A 2-11.5 (in) NPSM N/A 1.5 in N/A 3.75 in N/A 1.75 in N/A 2.95 N/A 4.5 lb N/A 0.75 in
2-ST N/A 2-11.5 (in) NPSM N/A 2 in N/A 3.75 in N/A 1.75 in N/A 2.95 N/A 4.5 lb N/A 0.75 in
2.5-ST N/A 3-8 (in) NPSM N/A 2.5 in N/A 4.75 in N/A 1.75 in N/A 4.06 N/A 6.5 lb N/A 0.75 in
3-ST N/A 3-8 (in) NPSM N/A 3 in N/A 4.75 in N/A 1.75 in N/A 3.8 N/A 6.5 lb N/A 0.75 in
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