JosamQuality Engineered Since 1914
A Watts Brand (acquired January 2024) and a U.S. specification-grade manufacturer of engineered cast iron, stainless steel, SMC/GRP trench, and 316L push-fit drainage. Built on three core principles: Quality, Service, and Competitiveness. "We don't aim to be the biggest, but the best at what we do."
Discover the PRO-PLUS® Difference
Advanced SMC/GRP (Sheet Molding Compound/Glass Reinforced Plastic) trench drain system offering lighter weight, stronger construction, and less expansion/contraction than polymer concrete, polypropylene, and HDPE.
PRO-PLUS 100 Series
Complete 4" internal width trench drain system with SMC/GRP channels and compatible grates for standard applications.
- 4" internal width
- Channels & grates
- Multiple load ratings
PRO-PLUS 200 Series
Complete 8" high-capacity trench drain system with SMC/GRP channels and heavy-duty grates for industrial applications.
- 8" internal width
- Heavy-duty rated
- Industrial grade
Complete Cast Iron Solutions
A complete line of quality cast iron and PVC specification drainage products available in various finishes with a multitude of optional features.
Water Closet Carriers
Wall-mounted toilet support systems with single bolt height adjustment, compact design, and square upright construction.
- Single bolt adjustment
- Pre-Fab packages
- Multiple connections
Fixture Carriers
Support systems for lavatories, sinks, and wall-mounted fixtures with industry-leading 4¼" height adjustment.
- 4¼" height adjustment
- ASME A112.6.4 tested
- O-Ring seal design
Roof Drains
Complete roof drainage solutions with non-puncturing clamp rings, various dome options, and Pre-Fab Base availability.
- Multiple dome options
- Pre-Fab Base option
- Underdeck clamps
Floor Drains
Specification floor drains featuring the patented double-drainage flange design (1914), still the industry standard.
- Double-drainage flange
- Round & square tops
- Pre-Fab Base option
Floor Sinks
Sanitary floor sinks with coated cast iron body for commercial kitchens and food service applications.
- Coated cast iron
- Multiple sizes
- Pre-Fab Base option
Cleanouts
Access points for drain line maintenance including floor and wall cleanouts with various cover options.
- Floor & wall types
- Multiple finishes
- Pre-Fab Base option
Grease Interceptors
Grease management solutions for commercial kitchens and food service with code-compliant designs.
- Various capacities
- Code-compliant
- Commercial grade
Oil/Solids Interceptors
Separation systems for oils, sediment, and solids in industrial applications.
- Oil separation
- Solids capture
- Industrial grade
Backwater Valves
Prevention of sewage backflow with swing-check, ball-float, and combined drain types.
- Multiple valve types
- Hub & No-Hub
- Combined drain options
Trench & Channel Drains
Linear cast iron drainage solutions with multiple grate options for various applications.
- Linear drainage
- Multiple grates
- Cast iron construction
Hydrants
Wall and yard hydrants for building water access in commercial and industrial settings.
- Wall hydrants
- Yard hydrants
- Freeze protection
Shock Absorbers
Water hammer arrestors to protect plumbing systems from pressure surges.
- Water hammer protection
- Multiple sizes
- Easy installation
Traps & Accessories
P-traps, trap primers, Jiffee Joint gaskets, and related accessories for complete drainage systems.
- P-traps
- Trap primers
- Jiffee Joint gaskets
Lite Line
Economy drainage products maintaining Josam quality at accessible price points for budget-conscious projects.
- Budget-friendly
- Josam quality
- Multiple products
Hygienic Stainless Steel Solutions
304 or 316L Stainless Steel drainage products with non-porous surfaces for superior hygiene, corrosion resistance, and sustainable design. Ideal for applications where bacteria growth is a concern.
Stainless Steel Floor Drains
Point drains in 304 or 316L stainless steel with round and square tops for hygienic applications.
- 304 or 316L SS
- Round & square tops
- 8"-16" sizes
Stainless Steel Trench Drains
Linear drainage in stainless steel for heavy-use environments with customizable dimensions.
- Customizable sizes
- Multiple grates
- Hygienic design
Stainless Steel Cleanouts
Access points with clean, attractive stainless steel appearance for professional installations.
- Professional finish
- Easy access
- Corrosion resistant
Retrofit Liners
Renovation solutions providing completely new waterway and appearance for existing drains.
- 8", 12", 16" sizes
- Various depths
- New waterway
Slot & Mini Channels
Low-profile linear drainage ideal for isolating areas and minimizing floor slope requirements.
- Up to 13 ft lengths
- Low profile
- Flexible design
Shower Channels
Designer drainage for institutional and residential showers with stylish, low-profile appearance.
- Low profile
- Stylish design
- 2" no-hub outlets
Labor-Saving Push-Fit System
Complete line of 316L austenitic stainless steel Push-Fit pipes, fittings, and accessories. Quick and easy joining method—lubricate and push. ISO 9001 certified manufacturing with pressure rating at least 4x higher than other SS push-fit systems.
Push-Fit Pipes
316L stainless steel pipes with labor-saving push-fit design in sizes from 1-1/2" to 8".
- 1-1/2" to 8" sizes
- 8 length options
- Quick joining
Access Pipes
Pipes with built-in access points for inspection and maintenance of drainage systems.
- Inspection access
- Maintenance ready
- Push-fit design
Expansion Pipes
Pipes designed to accommodate thermal expansion in stainless steel drainage systems.
- Thermal expansion
- System protection
- Push-fit design
Bends
Directional fittings for pipe routing with various angles available.
- Various angles
- Push-fit design
- 316L stainless
Branches (Tees, Wyes)
Junction fittings including tees, wyes, and other configurations for pipe distribution.
- Tees & wyes
- Multiple configs
- Push-fit design
Adapters & Reducers
Transition fittings for size and connection changes between different pipe systems.
- Size transitions
- Connection adapters
- Compatible couplings
Traps, Plugs & Couplings
P-traps, test plugs, double couplings, slip couplings, and miscellaneous fittings.
- P-traps
- Test plugs
- Couplings
Hangers & Clamps
Support and mounting hardware for secure push-fit pipe installation.
- Pipe support
- Secure mounting
- Easy installation
Quality. Service.Competitiveness.
Quality Engineered
Stringent Quality Control at in-house and off-site facilities. Products ship pre-packaged, labeled, and partially assembled.
Material Expertise
Cast iron, stainless steel (304 & 316L), PVC, SMC/GRP, and polymer concrete options for every application.
Inventory Availability
Products ship pre-packaged, labeled with part numbers, and partially assembled at no extra charge, with a Pre-Fab Base option on select drains for fast post-pour installation.
Where Josam Drainage Fits
Compare Josam's spec-grade line against manufacturer-agnostic product types, then see the commercial, institutional, and industrial settings where it is specified.
By product type
- Trench drains — compare the SMC/GRP PRO-PLUS and cast iron channel against other systems.
- Drainage grates — EN 1433 Class A–F ductile iron, stainless, and GRP grate options.
- Backwater valves — swing-check, ball-float, and combined-drain backflow prevention.
- Catch basins — point-collection drainage that pairs with engineered linear runs.
By application
- Commercial kitchens — floor sinks, grease interceptors, and stainless drainage.
- Hospitals & healthcare — hygienic 316L drains and ASME-tested fixture carriers.
- Food & beverage processing — corrosion-resistant stainless trench and slot channels.
- Manufacturing facilities — heavy-duty trench, oil/solids interceptors, and roof drains.
Ready to Specify Josam Products?
Our drainage specialists can help you select the right Josam solutions for your project and provide competitive pricing.