Sioux Chief 88088 4" PVC Hardh...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$0.55
Sioux Chief 88088 4" PVC Hardhat Pressure Test Cap, Thick-Wall

Sioux Chief 88088 4" PVC Hardhat Pressure Test Cap, Thick-Wall

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Model: 880-02P

In Stock (leaves warehouse same day if ordered before 3pm ET)

$0.55
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Sioux Chief 88088 4" PVC Hardhat Pressure Test Cap

The Sioux Chief 88088 is a 4" PVC Hardhat Test Cap built for rough-in plumbers and contractors who need a reliable temporary seal for pressure-testing DWV and drain lines before final hookups. Available under the 'Test' / 'Tst' type designation, this cap is molded from PVC with a notably thicker wall section than standard test caps, engineered to hold higher test pressures than most comparable caps on the market and giving crews confidence during code-required pressure tests. A deep socket design provides more surface area for the glue joint, helping ensure a tighter, more dependable seal while the line is under test pressure. This is a test cap, not a permanent fitting, and it should be removed once testing is complete and the line is ready for final connection.

Key Features

  • Trade Size: 4" for use on 4" PVC drain, waste, and vent piping during pressure testing.
  • Durable Construction: Molded PVC body with a thicker wall section than most test caps for added strength under pressure.
  • Deep Socket Design: Provides extra surface area for the glue joint, supporting a more secure, leak-resistant bond during testing.
  • Higher Pressure Capacity: Holds higher test pressures than most comparable test caps, suited to demanding rough-in test scenarios.
  • Temporary Use Only: Designed specifically for pressure testing and is not intended for permanent installation in the finished system.
  • Hardhat Profile: Rounded cap profile for straightforward handling and removal once testing is finished.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 100 EA

Typical Applications

  • Pressure testing 4" PVC drain, waste, and vent lines before final tie-in
  • Residential and commercial rough-in plumbing inspections
  • Temporary sealing of open pipe ends during code-required pressure tests
  • New construction DWV system testing prior to wall and floor closure
  • Renovation projects requiring line testing before fixture connection

Why Sioux Chief?

Sioux Chief builds rough-in plumbing products engineered for the realities of jobsite pressure testing, and the 88088 Hardhat Test Cap reflects that focus with its thicker PVC wall section and deep glue-joint socket designed to hold higher test pressures than most test caps. Manufactured in the United States and packaged 100 to a case, this test cap gives plumbing contractors a dependable, purpose-built tool to confirm system integrity before a line is closed up for good. Remember that this cap is intended strictly for temporary pressure testing, not as a permanent fitting in the finished system, and should be removed once the 4" PVC line passes inspection and is ready for its final connection.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Test Cap
Country of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Pipe and Tubing
Product Material:
PVC
Product Size:
4"

Sioux Chief 880-02P – Frequently Asked Questions

1) Can the Sioux Chief 88088 test cap be left in the line permanently after the inspection passes?
No. The 88088 Hardhat cap is a temporary pressure test cap only. It glues into the pipe end to hold the line under test pressure, and it has to be cut or knocked out once the 4 inch PVC line passes inspection so the permanent fitting can be made up. It is not a finished-system fitting.
2) Will a 4 inch PVC test cap fit ABS or cast iron drain pipe?
The 88088 is molded PVC and seals with a solvent-weld glue joint, so it is meant for 4 inch PVC DWV pipe. PVC cement will not bond ABS or cast iron, so for those materials you need the matching material cap or a mechanical test plug instead.
3) Does the 88088 cap go inside the pipe or over the outside of a 4 inch hub?
It is a socket-style cap: the deep socket slips over the outside of the 4 inch PVC pipe end and is solvent welded. The extra socket depth gives more glue surface than a shallow cap, which is what keeps the joint from blowing off under test pressure. If your open end is a hub rather than a spigot, you want an internal test plug, not this cap.
4) Why pick a thick-wall test cap over a standard PVC test cap?
The 88088 is molded with a notably thicker wall section than a standard test cap, so it holds higher test pressures. On a tall stack or a deep water column test where a thin cap can bulge or fail, the heavier wall is the reason to spend on it. For a low-head or short-run test, a standard cap does the same job.
5) What does the Type option on the Sioux Chief 88088 test cap mean when ordering?
The cap is ordered under a Type designation shown as Test or Tst, covering part numbers 880-04P and 880-02P. Confirm the part number on your order matches the 4 inch size you need, since the designation itself does not change how the cap installs.
6) Is this the right cap for testing a DWV system before the walls close up?
Yes, that is exactly the use. The Hardhat cap seals open 4 inch PVC drain, waste and vent ends for code-required pressure tests during new construction rough-in or a renovation, then comes off before the fixture tie-in. Plan on removing every cap before the system goes into service.
7) How many 4 inch Sioux Chief Hardhat test caps come in a case?
They are packaged 100 each per case, which suits a rough-in crew capping multiple openings across a job rather than a one-off repair. The caps are made in the United States.
How fast can I get the Sioux Chief 880-02P delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sioux Chief 880-02P come with a warranty?
Absolutely. The Sioux Chief 880-02P is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sioux Chief 880-02P?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Sioux Chief 880-02P from ZenSupply?
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