Pasco 5666SR Flexible Coupling...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$32.91
Pasco 5666SR Flexible Coupling with Stainless Steel Ring, Cast Iron to Plastic Pipe

Pasco 5666SR Flexible Coupling with Stainless Steel Ring, Cast Iron to Plastic Pipe

(No reviews yet) Write a Review

Model: 5644PRC

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

$32.91
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Pasco 5666SR Flexible Coupling with Stainless Steel Ring, Cast Iron to Plastic Pipe

The Pasco 5666SR is a flexible transition coupling built to join cast iron pipe or plastic pipe to cast iron pipe or plastic pipe in rough-in drain, waste, and vent (DWV) applications. Available in 4" and 6" sizes, this coupling is secured with a stainless steel ring, giving plumbers and contractors a dependable way to tie dissimilar pipe materials together behind the wall or under the floor without sourcing separate reducing fittings for each material combination. Sold in a case quantity of 50 EA, with a minimum order quantity of 1 EA, the 5666SR is suited for contractors stocking rough-in supply for repair, retrofit, and new construction work wherever cast iron meets plastic DWV piping.

Key Features

  • Available Sizes: Offered in 4" and 6" sizes to match common cast iron and plastic DWV pipe diameters found in rough-in plumbing.
  • Flexible Coupling Design: Connects cast iron pipe or plastic pipe to cast iron pipe or plastic pipe, allowing a single fitting to bridge two different pipe materials on a DWV run.
  • Stainless Steel Ring: The coupling is banded with a stainless steel ring for a secure, durable clamp-down at the pipe transition point.
  • Transition Fitting: Eliminates the need for multiple material-specific couplings when a drain, waste, or vent line transitions from cast iron to plastic or plastic to cast iron.
  • Case Packaging: Supplied 50 EA per case, with a minimum order quantity of 1 EA, making it practical for stocking trucks or supply houses.
  • Rough-In Application: Designed for behind-the-wall and under-floor plumbing connections rather than exposed decorative fixtures.

Technical Specifications

  • Prop 65 Warning: Y
  • Size Range: 4" - 6"
  • Quantity: 50 EA per case
  • Minimum Order Quantity: 1 EA

Typical Applications

  • Cast Iron to Plastic Drain-Waste-Vent Transitions
  • Residential and Commercial Rough-In Plumbing
  • Pipe Repair and Retrofit Work
  • New Construction DWV Installations
  • Supply House and Contractor Truck Stock

Why Pasco?

Pasco supplies rough-in plumbing hardware built for the everyday demands of contractors and plumbing crews. The 5666SR flexible coupling's stainless steel ring construction is designed to give installers a dependable transition point when joining cast iron and plastic pipe in 4" or 6" sizes, helping crews complete DWV connections without sourcing multiple specialty fittings for each material pairing. Stocked in case quantities of 50 EA with a minimum order quantity of 1 EA, it supports efficient truck and warehouse inventory for trade professionals handling both repair and new installation projects across a range of rough-in pipe diameters.

Manufacturer Resources

Product Specs

Prop 65 Warning:
Y
Product Type:
Flexible Coupling
Minimum Order Quantity:
1 EA
list_batch:
PAO-20260924
Department:
Plumbing
Product Subgroup:
Fittings and Valves
Product Material:
Cast Iron
Product Color:
Stainless Steel Ring
Item Quantity:
50

Pasco 5644PRC – Frequently Asked Questions

1) Will the Pasco 5666SR coupling join cast iron to PVC drain pipe?
That is exactly what it is for. The Pasco 5666SR flexible coupling bridges cast iron pipe to plastic pipe (or plastic to plastic, or cast iron to cast iron) on drain, waste, and vent runs, so one fitting handles the dissimilar-material transition instead of hunting separate reducing fittings for each side.
2) What pipe sizes does the Pasco 5666SR flexible coupling come in?
Two sizes, 4 inch and 6 inch, matching the common cast iron and plastic DWV diameters on a rough-in. The 4 inch is part number 5644PRC and the 6 inch is 5666SR, so order by the number that matches your line.
3) Can I use this flexible coupling on a cast iron repair cut-in without replacing the whole line?
Yes, that is a standard use. The 5666SR is listed for repair and retrofit work as well as new construction, so you can cut out a bad section of 4 inch or 6 inch cast iron, drop in plastic, and band each end with the stainless ring coupling.
4) Is the clamp on this Pasco transition coupling stainless steel?
Yes. The coupling is banded with a stainless steel ring at the transition point, which is what you want for a buried or under-floor joint where a plated band would eventually give up.
5) Can I buy just one Pasco 5666SR coupling, or do I have to take a full case?
Minimum order is 1 each, so a single coupling for a repair call is fine. Full cases run 50 each if you are stocking a truck or a shop shelf.
6) Is this Pasco coupling meant for exposed trap or fixture connections?
No. The 5666SR is a rough-in fitting for behind-the-wall and under-floor DWV connections, not an exposed decorative fixture connection. If the joint will be visible under a sink or in a finished space, use a chrome or finished trap adapter instead.
7) Does the Pasco 5666SR carry a Prop 65 warning?
Yes, a California Proposition 65 warning applies to the 5666SR flexible coupling. Facility and institutional buyers who log Prop 65 items for their jobsite documentation should flag it on receipt.
How fast can I get the Pasco 5644PRC 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 Pasco 5644PRC come with a warranty?
Absolutely. The Pasco 5644PRC 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 Pasco 5644PRC?
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 Pasco 5644PRC from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!