PVC fitting manufacturers have developed a useful uniform numbering system to classify fittings by material, inlet types, and inlet sizes. The graphic below illustrates how this system works.

  • • A prefix of “1” indicates that the fitting is a barbed poly pipe fitting.
  • • If the first number is “4” then the fitting is Sch. 40. Example: 429-010 (typically a white colored fitting)
  • • If the first number is “8” then the fitting is Sch. 80. Example: 829-010 (typically a grey colored fitting)
  • • The first three numbers indicate the type of fitting and inlet types: For Example Slip Tee (401), FIPT Elbow (408), MIPT x Slip Male Adapter (436), etc. Find out more about inlet types like FIPT, MIPT, Spigot, and Slip in our Irrigation Glossary.
  • • The second set of numbers, after the dash, indicate the size. For example a 401-010 is a 1″ tee, 406-005 is a 1/2″ elbow, 407-101 is a 3/4″ x 1/2″ slip x thread elbow.

PVC Fitting Numbering System

401

Tee: Slip x Slip x Slip

402

Tee: Slip x Slip x FIPT

405

Tee: FIPT x FIPT x FIPT

406

Ell: Slip x Slip

407

Ell: Slip x FIPT

408

Ell: FIPT x FIPT

409

Ell: Spigot x Slip

410

Ell: MIPT x Slip

411

Ell: Spigot x FIPT

412

Ell: MIPT x FIPT

413

Side Outlet: Slip x Slip x Slip

414

Side Outlet: Slip x Slip x FIPT

417

45° Ell: Slip x Slip

420

Cross: Slip x Slip x Slip x Slip

429

Coupler: Slip x Slip

430

Coupler: FIPT x FIPT

434

Riser Extension: FIPT x MIPT

435

Female Adapter: Slip x FIPT

436

Male Adapter: MIPT x Slip

437

Reducer Bushing: Spigot x Slip

438

Reducer Bushing: Spigot x FIPT

439

Reducer Bushing: MIPT x FIPT

447

Cap: Slip

448

Cap: FIPT

449

Plug: Spigot

450

Plug: MIPT

463

Snap Tee: Snap x Slip

464

Snap Tee: Snap x FIPT

Single Size

1/2″ -005
3/4″ -007
1″ -010
1 1/4″ -012
1 1/2″ -015
2″ -020
2 1/2″ -025
3″ -030
4″ -040
5″ -050
6″ -060
8″ -080

Expanding Size

1/2″ x 3/4″ -074
3/4″ x 1″ -102
1″ x 1 1/4″ -132
1″ x 1 1/2″ -133
1 1/2″ x 2″ -213
3″ x 4″ -342

Reducing Size

3/4″ x 1/2″ -101
1″ x 1/2″ -130
1″ x 3/4″ -131
1 1/4″ x 1/2″ -166
1 1/4″ x 3/4″ -167
1 1/4″ x 1″ -168
1 1/2″ x 1/2″ -209
1 1/2″ x 3/4″ -210
1 1/2″ x 1″ -211
1 1/2″ x 1 1/4″ -212
2″ x 1/2″ -247
2″ x 3/4″ -248
2″ x 1″ -249
2″ x 1 1/4″ -250

Reducing Size Cont.

2″ x 1 1/2″ -251
2 1/2″ x 1/2″ -287
2 1/2″ x 3/4″ -288
2 1/2″ x 1″ -289
2 1/2″ x 1 1/4″ -290
2 1/2″ x 1 1/2″ -291
2 1/2″ x 2″ -292
3″ x 1/2″ -333
3″ x 3/4″ -334
3″ x 1″ -335
3″ x 1 1/4″ -336
3″ x 1 1/2″ -337
3″ x 2″ -338
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