PipeDev — Y-Piece / Wye

Y-Piece (Wye)

Symmetric breeches piece — a header splitting into two equal legs.

Principle & formula

Main diameter (D)

Branch diameter (d)

Included angle between legs (α)

Leg length (L)

Main pipe length (Lm)

Advanced — material & allowance

Material thickness (t)

Hem / seam allowance (a)

Second plate (companion)

Diameters are outside; development uses the neutral axis (Ø − t). Allowance adds a margin around the blank.

One leg shown — cut two. The second leg is the mirror image and develops to the same outline.

The two legs branch to opposite sides, so the openings sit half a circumference apart on the unrolled header.

Print at 100% scale. Dimensions are in millimetres.