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Rubber Sealing Ring for Chamfered BSP Ports (Buna N)

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These Rubber Sealing Rings can be used to seal chamfered BSP ports. If the port is flat, use a Dowty Sealing Washer (Part No. 3240-Size).

Note: BSP nomenclature can be confusing because the nominal size refers to the inside diameter of the pipe, not the outside diameter of the threads. If you are not sure what size you need, check in our Threaded Fitting Guide.

BSP O-Ring Dimensions
BSP Size ID (relaxed) OD Cross-Sectional Area Part No.
1/2 BSP 0.71" 0.90" 0.10" 3243-1/2BSP
3/8 BSP .052" 0.68" 0.085" 3243-3/8 BSP

Enter desired order quantities below, then click the "Add selected quantities to cart" button.

Order Qty
Part No.


Rubber Sealing Ring for 1/2 BSP Port

1 to 11: $0.79

12 to 149: $0.70

150 & up: $0.60

In Stock

3243-3/8 BSP

Rubber Sealing Ring for 3/8 BSP Port

1 to 11: $0.79

12 & up: $0.70

In Stock