ISOMETRICResources / Isometric symbols / FittingsUpdated 29 Oct 2026

Cap symbol

Also called Pipe cap, End cap

A cap closes the end of a pipe permanently.

Isometric

What the cap symbol means

A cap closes the end of a pipe permanently.

How it is drawn

Piping isometric, common form

A rounded end on the pipe, welded on.

Isometric SVG

Where you see it

Dead ends, future connections and the ends of headers.

What is written next to it

On the isometric, the cap usually carries an item number and size.

What gets checked on site

For a cap, the site checks usually cover the closing weld, and that it is included in the pressure test. Each check is recorded against the line and the joint, so the line can go into its test pack and be handed over with its evidence. See the ITR guide.

Frequently asked questions

What does the cap symbol look like?

A rounded end on the pipe, welded on.

Where is a cap used?

Dead ends, future connections and the ends of headers.

Every cap on your isometrics, tracked to the test pack.Deskely Testpack builds test packs from the line list and the drawings, records the test in the field and tracks reinstatement to the last spade.
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