2 Pcs 4 in PVC Bulkhead Fitting - 4 in NPT Tank Connector

Our review of this 2 pcs 4 in PVC bulkhead fitting finds it best suited for homeowners and small-scale installers who need a straightforward, durable through-tank connector. The bottom line: this pack offers a dependable bulkhead solution for rain barrels, water tanks and pool plumbing when a reliable, weather-tolerant seal and simple assembly are the priorities. The reviewer found the included EPDM washers and nuts made creating an airtight joint quick, and the PVC body stood up to installation without visible fading or cracking.

Key Features

• Pack count: Two identical 4 in bulkhead fittings provide an immediate spare or allow installation on two tanks without buying separate parts.
• Thread fit: Designed to accept most 4 in NPT male ends, the internal and external thread sizes facilitate a common plumbing connection for hoses and pipes.
• Included seals: EPDM washers and nuts are supplied to form an airtight seal, reducing leaks and saving a trip to the hardware store.
• Durable material: Molded from PVC, the fittings resist fading, peeling and cracking for longer life than ordinary plastics in outdoor use.
• Working range: Rated to handle up to 150 psi and temperatures from -20 to +150 F, suitable for many demanding residential and light industrial jobs.
• Installation guidance: Simple instructions note a 5-1/2 in hole is required, making upfront sizing checks easy to perform before drilling.

Who It's For

This bulkhead fitting is aimed at DIYers, gardeners and small-scale agricultural users who need a reliable through-wall connector for rain barrels, aquariums, tubs and similar tanks. It is especially useful where a spare fitting is handy or where two identical through-connections are required.

Those installing in high-end industrial systems that require specialized materials beyond PVC or custom thread standards should look elsewhere; likewise, installers who need metric fittings or non-NPT thread types will need a different part.

Pros & Cons

Pros

• Comes as a two-pack which provides value and convenience for multiple installations.
• Includes EPDM washers and nuts so the seal can be made airtight without extra purchases.
• PVC construction resists fading, peeling and cracking in outdoor conditions for longer service life.
• Wide temperature and pressure tolerance makes it versatile for many applications.

Cons

• Requires a 5-1/2 in hole, so precise hole cutting and size checks are essential before installation.

Specifications

Package contents	2 PVC bulkhead fittings with EPDM washers and nuts
Overall length	9.4 cm / 3.7 in
External thread diameter	13.8 cm / 5.43 in
Internal thread diameter	11 cm / 4.33 in
Compatible thread	Most 4 in NPT male ends
Working pressure	Up to 150 psi
Temperature range	-20 to +150 F

Our Verdict

For homeowners and small operations needing a no-frills, reliable through-tank connector, this two-pack of 4 in PVC bulkhead fittings is a practical buy. The included EPDM washers and nuts, reasonable pressure and temperature ratings, plus durable PVC construction make it good value for rain barrels, tanks and garden plumbing where standard 4 in NPT compatibility is required.

Frequently Asked Questions

What hole size is needed?
Drill a 5-1/2 in hole in the tank as the package instructions recommend; confirm measurements before cutting.

Will it fit my hose or pipe?
It is designed for most 4 in NPT male ends; verify your pipe or hose uses 4 in NPT to ensure compatibility.

Are seals included?
Yes, EPDM washers and nuts are included to help form an airtight, leak-resistant seal.