What size hole do I cut for your bulkhead fittings?

This is a list of various tank or bulkhead fittings that we offer and the hole sizes that they require to install them into a tank or container.

PVC and PP Bulkhead Fittings

Hole Size

FNPT

Part Numbers
PVC/Neoprene         PP/Neoprene           PVC/Viton              PP/Viton

1-1/8”

1/4"

16401                      16421                     16641                    16657

1-1/8”

3/8”

16402                      16422                     16642                    16658

1-1/8”

1/2"

16403                      16423                     16643                    16659

1-3/8”

3/4"

16404                      16424                     16644                    16660

1-3/4”

1”

16405                      16425                     16645                    16661

2”

1-1/4”

16406                      16426                     16646                    16662

2-1/4”

1-1/2”

16407                      16427                     16647                    16663

2-7/8”

2”

16408                      16428                    16648                     1666

Maximum wall thickness for above tank fittings: 1/4" – 1” sizes          1/4” wall thickness
                                                                     1-1/4” – 2” sizes        3/8” wall thickness 

 PVC & Polypropylene Heavy Duty Tank Fittings

Hole Size

FNPT X Socket

Part Numbers
PVC/EPDM             PP/EPDM

1-1/4”

1/2"

16448                     16468

1-5/8”

3/4"

16449                     16469

1-7/8”

1”

16450                     16470

2-5/16”

1-1/4”

16444                     16464

2-9/16”

1-1/2”

16445                     16465

3-3/16”

2”

16446                     16466

Hole Size

FNPT X FNPT

Part Numbers
PP/EPDM

1-1/4”

1/2"

16439

1-5/8”

3/4"

16440

1-7/8”

1”

16460

2-5/16”

1-1/4”

16539

2-9/16”

1-1/2”

16540

3-3/16”

2”

16544

Banjo® Polypropylene Bulkhead Tanks Fittings with EPDM Gaskets

Hole Size

FNPT X FNPT

Part Numbers

1-5/8”

1/2”

32182

1-5/8”

3/4"

32183

2-1/4”

1”

32194

2-1/4”

1-1/4”

32195

3”

1-1/4”

32199

3”

2”

32200

3-1/4”

2”

32227

4-1/2”

3”

32228

5-3/4”

4”

32229

Heavy Duty Polypropylene Tank Fittings with EPDM Gaskets

Hole Size

FNPT X FNPT

Part Numbers

1-7/16”

1/2"

11800

1-5/8”

3/4”

11801

2-1/4”

1”

11802

2-1/4”

1-1/4”

11803

3”

1-1/2”

11804

3”

2”

11805

Hayward ® BFA Series Industrial Bulkhead Fittings with EPDM Gaskets

Hole Size

FNPT X FNPT

Part Numbers
PVC        PP     CPVC

Max. Wall thickness

1.38”

1/2”

16625   16687   16548

2.08”

1.63”

3/4”

16626   16688   16556

2.08”

1.88”

1”

16635   16689   16560

2.08”

2.65”

1-1/4”

16636   16690   16576

2.00”

2.65”

1-1/2”

16637   16691       -

2.00”

3.25”

2”

16638   16692   16577

2.00”

4.50”

3”

16639   16693   16578

2.12”

5.75”

4”

16640   16694   16579

2.45”

This is a good choice for thick walled tanks. Minimum Diameter of Tanks for Hayward® BFA Bulkhead Fitting Installation

Bulkhead Size

Minimum Rigid Tank ID

Minimum Flexible Tank ID

1/2"

7.25”

6.50”

3/4"

10.00”

9.25”

1”

11.75”

10.70”

1-1/4”

16.25”

12.19”

1-1/2”

16.25”

12.19”

2”

25.75”

19.38”

3”

30.00”

25.25”

4”

60.00”

55.00”

 Hayward ® BFAS Series Industrial Bulkhead Fittings

Hole Size

FNPT x FNPT - PVC & PP
FNPT x Socket - CPVC

Part Number
PVC/FPM   PVC/EPDM   PP/FPM   PP/EPDM   CPVC/EPDM

1.38”

1/2”

16685         16705            16711      16723          16729   

1.63”

3/4"

16686         16706            16712      16724          16730

1.88”

1”

16701         16707            16713      16725          16731

2.63”

1-1/4”

16702         16708            16714      16726          16732

2.63”

1-1/2”

16703         16709            16715      16727          16733

3.25”

2”

16704         16010            16716      16728          16734

Minimum Diameter of Tanks for Hayward® BFAS Bulkhead Fitting Installation

Bulkhead Size

Minimum Rigid Tank ID

Minimum Flexible Tank ID

Max. Wall Thickness

1/2"

7.25”

6.50”

1.08”

3/4"

10.00”

9.25”

1.08”

1”

11.75”

10.70”

1.08”

1-1/4”

16.25”

12.19”

1.00”

1-1/2”

16.25”

12.19”

1.00”

2”

25.75”

19.38”

1.00”

3”

30.00”

25.25”

1.02”

4”

60.00”

55.00”

2.45”

 Spear’s PVC Tank Adapters

Hole Size

FNPT x FNPT

Minimum Inside Radius

Maximum Wall Thickness

Part Number
PVC/EPDM     PVC/Viton™

1-1/16”

1/4"

2.50”

.50”

29215              29217

1-3/16”

3/8”

3.00”

.50”

29216              29218

1-1/2”

1/2"

4.00”

.75”

29187              29219  

1-3/4”

3/4"

5.00”

.75”

29188              29220

2”

1”

7.00”

.86”

29189              29221

2-3/8”

1-1/4

9.50”

.86”

29190              29222

2-3/4”

1-1/2”

12.00”

.86”

29191              29223

3-3/8”

2”

18.50”

1.19”

29192              29224

4-5/8”

3”

32.50”

2.00”

29193              29225

5-1/2”

4”

43.50”

1.25”

29194              29226

Spear’s CPVC Tank Adapters

Hole Size

FNPT x FNPT

Minimum Inside Radius

Maximum Wall Thickness

Part Number
CPVC/EPDM

1-1/2”

1/2"

4.00”

.75”

29195

1-3/4”

3/4"

5.00”

.75”

29196

2”

1”

7.00”

.86”

29197

2-3/4”