Sioux Chief 9958 Rubber Slip J...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2.33
Sioux Chief 9958 Rubber Slip Joint Washer, 1-1/2" x 1-1/4"

Sioux Chief 9958 Rubber Slip Joint Washer, 1-1/2" x 1-1/4"

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Model: 9958

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

$2.33
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Sioux Chief 9958 Rubber Slip Joint Washer, 1-1/2" x 1-1/4"

The Sioux Chief 9958 is a rubber slip joint washer sized 1-1/2" x 1-1/4", built for tubular drain and waste connections where a slip nut threads down and compresses the washer against the pipe wall to form a leak-resistant seal. Molded from rubber for flexible, gap-filling contact, this washer suits P-trap, tailpiece, and other tubular fitting assemblies that step down from 1-1/2" tubing to a 1-1/4" connection, or the reverse, wherever a slip-joint nut and washer combination is used to close the joint. It is manufactured in the United States and packaged in bulk cartons of 1000 EA, making it a practical stock item for plumbing wholesalers and service trucks that regularly replace worn or hardened slip-joint washers during trap and tailpiece repairs.

Key Features

  • Trade Size: 1-1/2" x 1-1/4" combination size for slip-joint connections between tubular waste pipes of differing diameters.
  • Rubber Construction: Flexible rubber material conforms to the pipe surface under slip-nut compression, helping seat a tight seal without over-tightening the nut.
  • Slip Joint Type: Designed to be used beneath a slip nut on P-traps, tailpieces, and other tubular drain-waste fittings rather than a solvent-welded or threaded joint.
  • Bulk Packaging: Sold in cartons of 1000 EA, sized for plumbing wholesalers, service trucks, and high-volume contractor use rather than single-unit retail.
  • Domestic Manufacturing: Made in the United States.
  • Replacement Part: A common maintenance item for re-sealing existing slip-joint connections when the original washer has hardened, cracked, or begun to leak.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 1000 EA per carton
  • Material: Rubber
  • Trade Size: 1-1/2" x 1-1/4"

Typical Applications

  • P-Trap and Tailpiece Slip-Joint Connections
  • Tubular Drain and Waste Assembly Repairs
  • Reducing Connections Between 1-1/2" and 1-1/4" Tubular Pipe
  • Service Truck and Maintenance Washer Replacement
  • Residential and Commercial Rough-In Plumbing
  • Wholesale Stock for Plumbing Distributors

Why Sioux Chief?

Sioux Chief is a trusted source for tubular drain and waste hardware used daily by plumbing professionals on rough-in and repair work alike. The 9958 rubber slip joint washer is manufactured in the United States and supplied in bulk 1000-count cartons, giving wholesalers, contractors, and service trucks a reliable, ready-to-stock replacement part for slip-joint repairs, trap servicing, and tubular waste assembly without having to special-order small quantities.

Manufacturer Resources

Sioux Chief Product Catalog

Product Specs

Product Type:
Slip Joint Washer
Connection Type:
Slip Joint
Country Of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Material:
Rubber
Product Size:
1-1/2" x 1-1/4"

Sioux Chief 9958 – Frequently Asked Questions

1) What does the 1-1/2" x 1-1/4" size on the Sioux Chief 9958 slip joint washer actually mean?
The Sioux Chief 9958 is a reducing slip joint washer: it seals where 1-1/2 inch tubular waste meets a 1-1/4 inch connection (or the reverse). The rubber washer sits under the slip nut and compresses against the pipe wall to close the joint. If both sides of your joint are the same diameter, you want a straight 1-1/2 or 1-1/4 washer instead, not this combination size.
2) Does the Sioux Chief 9958 work on threaded or glued drain connections?
No. It only works on slip-joint connections, where a slip nut threads down over the washer to seal against the outside of the tube. A solvent-welded PVC joint needs cement and no washer, and a threaded joint seals on the thread with tape or dope. Using this washer on either one will not hold.
3) My sink trap is weeping at the slip nut - will replacing the washer fix it?
Usually, yes. Slip-joint washers harden, crack, and take a set over time, and that is the most common cause of a slow drip at a trap or tailpiece nut. Back the nut off, pull the old washer, and fit a fresh rubber one of the matching size. For a joint stepping between 1-1/2 inch and 1-1/4 inch tubing, the 9958 is the size you need.
4) Can I use a rubber slip joint washer on a P-trap, or do I need a plastic one?
Rubber is the right choice for slip-nut joints on P-traps, tailpieces, and other tubular drain and waste fittings. The 9958 is molded rubber, so it deforms around the pipe surface as the nut is tightened and seats without needing to be cranked down hard. Plastic and nylon washers rely on a wedge fit instead; they do not conform the way rubber does on an out-of-round or lightly scored tube.
5) How is the 9958 washer packaged - can I get a small quantity?
The 9958 ships in bulk cartons of 1000 each. It is stocked that way for plumbing wholesalers, service trucks, and high-volume repair work, not as a single-piece retail item. If you only need one or two washers, this is the wrong pack for you.
How fast can I get the Sioux Chief 9958 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 9958 come with a warranty?
Absolutely. The Sioux Chief 9958 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 9958?
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 9958 from ZenSupply?
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