PV-LOK PWP-C24 bell joint restraint with its restraining rods, nuts and washers

Photos show several models and sizes. Your restraint is in the item number.

Item # PWP-C8 Questions and answers (7)

PV-LOK Serrated Restraints

Serrated restraints for PVC pipe, 2 to 48 in., at bell joints, ductile iron fittings and PVC fittings. Pick the pipe, the joint and the model, then the size and coating.

View price list (PDF)

Machined serrations, not as cast, grip the PVC pipe wall and support it fully
Rated to the working pressure of the PVC pipe it is installed on, within each catalog's limits
See all specifications

Pipe: C900/C905

Joint: Bell joint

Model: PWP

Size: 8 in.

Made: Import

Need it domestic? Pick Domestic.

Coating: Standard

Standard shop coating on the ductile iron rings.

Your distributor

SIGMA sells through waterworks distributors. Order with item # PWP-C8.

Quote from SIGMA

Job location

Sends your quote list to the right regional team.

Quantity

Download the PV-LOK PWP submittal

Need help on the job?

Call 800.999.2550 with the pipe, the joint and the size.

PV-LOK or SLCE? Selection Tool Length of pipe requiring restraint: Calculator

Everything about the 8 in. PV-LOK PWP.

Details, specs, every size and the questions buyers ask. Open what you need.

Product detailsWhat it is, highlights and documents

About PV-LOK

PV-LOK is SIGMA's serrated restraint for PVC pipe. A split ductile iron ring with machined serrations, not as cast, clamps onto the pipe and grips the wall; rods or bolts tie it back across the joint.

Pick the pipe and the joint above, then the model. C900/C905 models fit PVC made to the ductile iron pipe OD, 4 to 48 in.; IPS models fit PVC made to the steel pipe OD, 2 to 12 in. The PT models have bi-directional serrations.

Ratings by pipe class, dimensions, drawings and installation steps are in each model's catalog, under Documents.

Highlights

C900/C905 PVC, 4 to 48 in.; IPS PVC, 2 to 12 in.
Split ductile iron clamping ring, ASTM A536 Grade 65-45-12, with machined serrations
Standard coating, or CorrSafe e-coat where the price list shows it

Documents

Specifications8 in. PV-LOK PWP

8 in. PV-LOK PWP

Item number	PWP-C8
Model	PWP: Bell joint restraint
Size	8 in.
Made	Import
Coating	Standard
Pressure rating	Equal to the PVC pipe it is installed on, within the limits in the model's catalog (see Ratings and use)
Max. joint deflection
Weight	27.00 lb
Crate quantity
Catalog page	Page 2 of the model's catalog
Price list	Import Restraint Products, effective 12/9/24, rev. 4/14/26

Materials

Clamping ring	Ductile iron, ASTM A536 Grade 65-45-12, with machined serrations
Side clamping bolts and nuts	High-strength steel per ASTM A449, zinc plated
Rods, T-bolts and nuts	High-strength low-alloy steel per ANSI/AWWA C111/A21.11
Coating	Standard coating, or CorrSafe epoxy e-coat (a cationic epoxy coating applied by electrodeposition) where the price list shows it
Hardware options	Type 304 or 316 stainless steel, or blue fluoropolymer-coated hardware, on PWM, PWP and PWH (September 2026 submittals); stainless steel or fluoropolymer-coated hardware on PTM, PTP and PTPF (their catalogs): ask your regional team

Ratings and use

Pressure rating	Equal to the working pressure of the PVC pipe it is installed on. The PWM, PWP, PWPF, PVM and PVP catalogs list ratings by pipe class; the PWH catalog lists 235 psi
Safety factor	Minimum 2:1 in the sample specifications of the PWM, PWP, PWPF, PTM, PTP, PTPF, PVM, PVP and PVPF catalogs, and 2:1 in the PWH submittal. The PWM catalog derates it at push-on joints that do not take all the rods
PWM at a push-on fitting	200 psi at 4 to 8 in.; 75 psi at 10 and 12 in. with 2 restraining rods, per the PWM catalog
On ductile iron pipe	PWP, 4 to 12 in.: 250 psi at 4 to 8 in. and 200 psi at 10 and 12 in., per the PWP catalog. PTP and PTM: ask your regional team
C909 PVCO pipe	PWP-C and PWM-C, 4 to 30 in., at 165 or 235 psi per SIGMA's C909 sheet (May 2026); do not over-tighten the T-bolts
Pipe in a casing	PWM, PTM, PVM, PWP, PTP and PVP: add at least 1-1/2 in. to the catalog B dimension for clearance. PWH: ask your regional team

Installation

Bell joints (PWP, PTP, PVP)	Make up the joint. Clamp one ring about 2 in. behind the insertion mark and one right behind the bell, then snug the rod nuts about one turn with a wrench
DI fittings (PWM, PTM, PVM)	Mark the pipe from the extra-long T-bolt (or rod), make up the mechanical joint to AWWA standards, clamp the ring at the mark, then snug the retaining nuts
PVC fittings (PWPF, PTPF, PVPF)	Set the beveled back-up ring behind the fitting bell, bevel toward the fitting end (follow the arrows on the ring), clamp the serrated ring about 2 in. in from the rod ends, then snug the nuts on both rings
PWH harness	Clamp the ring about 2 in. behind the insertion mark, set the two-piece back-up ring behind the bell, then snug the rod nuts
Every model	Tighten the side clamping bolts to the torque in the catalog, where it lists one. On single-direction models, face the ears as the catalog shows. Do not over-tighten the retaining nuts

From each model's PV-LOK catalog and the PWM, PWP and PWH submittals (September 2026); dates under Documents. Dimensions, drawings and, for most models, torque values are in the catalog.

Every size and item number14 sizes of the PV-LOK PWP · Import, Standard · item numbers

Showing the PV-LOK PWP, Import, Standard. Item numbers follow the options above. Pick a size to load it.

PV-LOK: item numbers and weights by size
Size	Item #	Weight
	PWP-C4	14.36 lb
	PWP-C6	16.44 lb
	PWP-C8	27.00 lb
	PWP-C10	44.40 lb
	PWP-C12	50.64 lb
	PWP-C14	101.61 lb
	PWP-C16	115.15 lb
	PWP-C18	164.97 lb
	PWP-C20	234.50 lb
	PWP-C24	288.50 lb
	PWP-C30	463.75 lb
	PWP-C36	520.40 lb
	PWP-C42	983.76 lb
	PWP-C48	1058.50 lb

Weights from the PWM, PWP and PWH submittals (September 2026) and the other models' catalogs; D-PWP shows the PWP values. Blank where neither shows one.

Questions and answers7 questions buyers ask about PV-LOK

Where do I find the price?

On SIGMA's price lists. Where an item is on a posted list, the View price list button near the top of this page opens it, and every posted list is on the Price Lists page. SIGMA sells through waterworks distributors, and your distributor sets your price. For contract pricing, ask your regional team.

PV-LOK or ONE-LOK SLCE: which one?

Both restrain PVC pipe. PV-LOK clamps a ring with machined serrations around the pipe and ties it back with rods or bolts: at a bell joint, a ductile iron fitting or a PVC fitting. ONE-LOK SLCE is a wedge-action gland for the mechanical joint itself. The Selection Tool narrows it by pipe, size and pressure.

C900/C905 or IPS: how do I tell?

By the pipe's outside diameter. C900/C905 PVC is made to the ductile iron pipe OD, and its PV-LOK item numbers carry -C before the size, as in PWM-C8. IPS PVC is made to the steel pipe OD, and its item numbers carry -S, as in PVM-S8. An 8 in. C900 pipe is 9.05 in. OD; an 8 in. IPS pipe is 8.63 in. OD.

What pressure is a PV-LOK rated for?

The working pressure of the PVC pipe it is installed on. The PWM, PWP, PWPF, PVM and PVP catalogs list ratings by pipe class: PWP on C900 DR18 pipe is 235 psi (4 to 36 in.), for example, and on DR25 pipe 165 psi. The PWH catalog lists 235 psi. At a push-on fitting joint with ear lugs, the PWM catalog sets 200 psi at 4 to 8 in. and 75 psi at 10 and 12 in. (with 2 restraining rods).

Which models have list prices?

PWM, PWP, PVM and PVP in every catalog size, PWPF from 4 to 12 in. and PVPF from 4 to 8 in. are on the Import Restraint Products price list, in standard coating or CorrSafe e-coat. D-PWP, 4 to 12 in., is on the Domestic Pipe Restraint Products price list. PWH, PTM, PTP and PTPF, and the other PWPF and PVPF sizes, are in SIGMA catalogs and priced by request.

Can PV-LOK go on ductile iron pipe?

PWP can, from 4 to 12 in.: its catalog rates it 250 psi at 4 to 8 in. and 200 psi at 10 and 12 in. on ductile iron pipe. For PTP and PTM on ductile iron pipe, ask your regional team. For the mechanical joints on ductile iron pipe, see ONE-LOK SLDE.

Does PV-LOK work on C909 PVCO pipe?

PWP-C and PWM-C do, from 4 to 30 in., per SIGMA's sheet for AWWA C909 pipe (May 2026). The sheet also lists ONE-LOK SLCE (4 to 30 in.) and SLCS (4 to 12 in.). The restraint's rated pressure is limited to the pipe's, and the sheet rates them at 165 and 235 psi; for higher, ask your regional team. On C909 pipe, do not over-tighten the T-bolts.