Phillips 16-720 STA-DRY 7-Way Trailer Receptacle – Wire Insertion, Split Pin

Replace a damaged or corroded trailer electrical socket with the genuine Phillips Industries 16-720 STA-DRY 7-Way Trailer Receptacle.

Designed for commercial truck and trailer electrical connections, this heavy-duty female socket features a corrosion-resistant nylon housing, seven split brass contacts, and screw-secured wire insertion terminals.

The Phillips STA-DRY design helps protect electrical connections against moisture, dirt, road salt, and other contaminants encountered in demanding commercial vehicle applications.

Unlike conventional metal receptacles, the 16-720 uses a durable, non-corrosive housing designed to resist exposure to magnesium chloride, salt, oil, grease, and fuel.

Its sealed inner cavity helps prevent moisture and contaminants from traveling through the socket into the wiring harness. A 5-degree downward angle promotes drainage, while the extended front barrel provides additional support at the plug connection.

The socket also includes a full-opening protective lid with a stainless steel hinge pin and spring for dependable operation.

Phillips Manufacturer Part Number: 16-720

Store SKU: LT335

Product Series: STA-DRY

Connector Type: 7-Way Female Trailer Receptacle

Termination: Screw-Secured Wire Insertion

Mounting: Two-Hole Flange

Standard: SAE J560

IMPORTANT: THIS LISTING INCLUDES ONE 7-WAY ELECTRICAL RECEPTACLE ONLY. TRAILER CABLE, COMPLETE NOSE BOX, CIRCUIT BREAKERS, AND OPTIONAL REAR PROTECTIVE BOOT ARE NOT INCLUDED.

Features & Benefits

• Genuine Phillips Industries 16-720: Heavy-duty STA-DRY replacement trailer receptacle.

• 7-Way Female Socket: Designed for compatible SAE J560 commercial truck and trailer electrical plugs.

• Split Brass Contacts: Help maintain dependable electrical contact with the mating plug.

• Wire Insertion Terminals: Screw-secured connections allow direct termination of trailer wiring.

• Corrosion-Resistant Nylon Housing: Resists moisture, road salt, magnesium chloride, oil, grease, and fuel.

• Sealed Inner Cavity: Helps prevent contamination from passing through the receptacle into the wiring harness.

• 5° Drainage Design: Angled socket configuration promotes moisture drainage.

• Extended Front Barrel: Provides additional support for the connected electrical plug.

• Protective Hinged Lid: Full-opening cover protects the socket contacts when disconnected.

• Stainless Steel Hinge Pin and Spring: Designed for durability in commercial vehicle service.

• Two-Hole Mounting: Elongated mounting holes accommodate compatible installation positions.

• SAE J560 Compliance: Designed for the standard heavy-duty commercial vehicle 7-way electrical connection.

Product Specifications

Heavy-Duty 7-Way Commercial Trailer Connection

The Phillips 16-720 provides the female electrical connection point for compatible SAE J560 7-way truck and trailer cables.

These connections are commonly used to supply electrical circuits for commercial trailer lighting and other designated vehicle functions.

The 7-way socket is designed for installation in a compatible mounting location on the vehicle or trailer.

Its seven-contact configuration should not be confused with smaller RV-style blade connectors or other types of seven-way plugs.

Verify that your existing cable uses an SAE J560 mating plug before ordering.

STA-DRY Corrosion-Resistant Design

Trailer electrical connections are continuously exposed to conditions that can cause corrosion and electrical failures.

These include road spray, salt, magnesium chloride, dirt, moisture, and vibration.

Phillips developed its STA-DRY electrical socket design to help reduce corrosion-related problems.

The 16-720 features:

• A durable, non-corrosive nylon housing

• A sealed inner cavity

• Split brass electrical contacts

• Stainless steel hinge hardware

• An angled opening to promote moisture drainage

The inner cavity helps prevent contaminants from traveling through the receptacle into the electrical wiring.

For additional protection behind the receptacle, Phillips recommends the separate 15-740 socket boot.

Wire Insertion Terminals with Securing Screws

The Phillips 16-720 uses wire insertion connections, meaning the trailer's electrical conductors are inserted into the designated terminal positions and secured with retaining screws.

This differs from receptacles that use ring terminals or bullet-style connectors.

Benefits of the wire insertion design include:

• Direct connection of compatible trailer wiring

• Screw-secured electrical conductors

• Serviceable wire terminations

• Convenient replacement during trailer electrical repairs

Important: Follow the Phillips installation instructions and the correct SAE J560 circuit diagram when wiring the receptacle. Never rely only on wire colors without verifying the intended circuit positions.

Durable Nylon Housing and Protective Lid

Phillips manufactures the STA-DRY 16-720 with a reinforced nylon housing designed for demanding commercial vehicle operating conditions.

Compared with conventional exposed metal housings, its non-corrosive construction helps reduce deterioration from road chemicals and moisture.

The socket also features:

• A full-opening hinged lid

• A stainless steel hinge pin

• A stainless steel lid spring

• A locking feature to help retain the mating plug

• Elongated mounting holes for adaptable installation

Together, these features help provide a durable connection for regular tractor-to-trailer coupling and uncoupling.

Extended Barrel and 5° Moisture Drainage

The Phillips 16-720 includes an extended front barrel that supports the connected electrical plug.

The socket is also designed with a 5-degree downward pitch to encourage moisture drainage.

These features are intended to reduce moisture accumulation and mechanical stress at the electrical connection.

Proper mounting and cable routing remain important for dependable operation.

Mounting and Dimensions

The 16-720 features a two-hole mounting flange with elongated mounting openings.

Published supplier dimensions include:

These are supplier-published dimensions. Compare the receptacle with your original part before drilling or modifying a mounting plate.

Phillips 16-720 vs. Other 7-Way Receptacles

Phillips offers several 7-way receptacles that look similar but use different wire termination methods.

Choose Phillips 16-720 when your application requires the non-corrosive STA-DRY housing and screw-secured wire insertion connections.

The 16-722 and 16-724 use different electrical termination styles and should not be substituted without checking the wiring arrangement.

Common Applications

The Phillips 16-720 is used in compatible commercial vehicle electrical systems, including:

• Roll-off trailers and trucks

• Semi-trailers

• Dump trailers

• Flatbed trailers

• Equipment trailers

• Waste and recycling vehicles

• Commercial tractor-to-trailer electrical connections

• Heavy-duty truck electrical system repairs

Fitment depends on the original receptacle, SAE J560 plug compatibility, mounting arrangement, and wiring configuration.

When Should You Replace a 7-Way Receptacle?

Common reasons to inspect or replace a trailer electrical socket include:

• Corroded or damaged contacts

• Broken protective lid

• Loose or damaged wire terminals

• Cracked housing

• Intermittent trailer lighting

• Poor electrical contact with the mating plug

• Damage to the mounting flange

• Water or contamination damage

Before replacing the receptacle, inspect the mating plug, electrical cable, wire terminations, grounding, and connected vehicle circuits.

How to Verify the Correct Replacement

1. Confirm the Part Number

Check your original component or equipment documentation for Phillips 16-720.

2. Verify the Connector Standard

Confirm that your application requires an SAE J560 7-way receptacle.

3. Check the Electrical Terminations

The 16-720 uses wire insertion with securing screws, not ring or bullet terminals.

4. Compare the Mounting Arrangement

Verify that your installation uses a compatible two-hole mounting pattern.

5. Inspect the Rear Cable Connection

Check whether the optional Phillips 15-740 protective boot or other cable protection is required.

6. Check the Original Electrical Wiring

Confirm the proper circuit assignments before reconnecting the trailer wires.

Frequently Asked Questions

What is Phillips part number 16-720?

It is a seven-way STA-DRY commercial trailer electrical receptacle with wire insertion terminals and split brass contacts.

Is Phillips 16-720 made by Truck-Lite?

No. The manufacturer is Phillips Industries.

Is this a male or female connector?

It is a female 7-way socket that accepts a compatible SAE J560 trailer electrical plug.

Does it use screw terminals?

Yes. Wires are inserted into the terminal positions and secured using retaining screws.

Is the housing metal or plastic?

The housing is durable, non-corrosive glass-filled nylon.

What are split brass pins?

Split contacts are designed to maintain electrical contact pressure against the mating plug.

Does it have a protective cover?

Yes. It includes a full-opening hinged lid with stainless steel hinge hardware.

How does it mount?

With a two-hole mounting flange.

Does it meet SAE J560?

Yes. Phillips identifies the 16-720 as meeting SAE J560 specifications.

Does the receptacle include a cable or nose box?

No. This listing is for the receptacle only.

What protective boot is recommended?

Phillips part 15-740, sold separately.

What is the store SKU?

The Roll Off Truck & Trailer Parts SKU is LT335.

Order Your Phillips 16-720 STA-DRY Receptacle

Restore a dependable commercial vehicle electrical connection with the genuine Phillips Industries 16-720 STA-DRY 7-Way Trailer Receptacle.

Featuring a non-corrosive nylon housing, screw-secured wire insertion terminals, split brass contacts, stainless steel hinge hardware, and a sealed inner cavity, this socket is designed for reliable operation in demanding truck and trailer environments.

Phillips Part #: 16-720

Store SKU: LT335

7-WAY FEMALE TRAILER RECEPTACLE

STA-DRY — WIRE INSERTION — SPLIT PIN

SAE J560 — TWO-HOLE MOUNT

RECEPTACLE ONLY — CABLE, NOSE BOX, AND OPTIONAL BOOT SOLD SEPARATELY

Order your Phillips 16-720 replacement trailer electrical receptacle online today!

Fitment Note: Verify connector standard, mounting-hole arrangement, electrical termination style, and wiring requirements before ordering.

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