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Dowty Sealing Washer for BSP Ports

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If your BSP fitting or port does not have a sealing flare or O-ring chamfer, you should use a Dowty Sealing Washer to seal the connection at the face of the female port. Dowty Sealing Washers are comprised of a flanged rubber insert bonded to the inside of a thick aluminum washer. The rubber insert is molded to stand slightly proud of each side of the washer to ensure a good seal.

If your male fitting has a concave flare at the end and the female has a matching convex flare, no sealing washer should be used. If the female port has a chamfer, use one of our BSP O-Ring Seals (Part No. 3243-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.

Dowty Sealing Washer Dimensions
BSP SizeIDOD
1/8 BSP0.38"0.60"
1/4 BSP0.51"0.80"
3/8 BSP0.66"0.94"
1/2 BSP0.84"1.13"
5/8 BSP0.91"1.25"
3/4 BSP1.07"1.37"

Order Qty

Part No.

Desc.

Price

Status

3240-1/2BSP

Dowty Sealing Washer for 1/2 BSP Ports

1 to 7: $4.99

8 to 59: $4.48

60 & up: $3.97

In Stock

3240-1/4BSP

Dowty Sealing Washer for 1/4 BSP Ports

1 to 9: $1.69

10 to 99: $1.50

100 & up: $1.31

In Stock

3240-1/8BSP

Dowty Sealing Washer for 1/8 BSP Ports

1 to 9: $1.69

10 to 99: $1.50

100 & up: $1.31

In Stock

3240-3/4BSP

Dowty Sealing Washer for 3/4 BSP Ports

1 to 7: $4.99

8 to 59: $4.48

60 to 499: $3.97

500 & up: $3.46

In Stock

3240-3/8 BSP

Dowty Sealing Washer for 3/8 BSP Ports

1 to 7: $4.99

8 to 59: $4.48

60 to 499: $3.97

500 & up: $3.46

In Stock

3240-5/8BSP

Dowty Sealing Washer for 5/8 BSP Ports

1 to 7: $4.99

8 to 59: $4.48

60 & up: $3.97

In Stock