Ames Fire & Waterworks
Since 1910 Ames has been a leader in the manufacture of valves and fittings for pipeline systems. Products include: automatic control valves, backflow prevention devices, check valves, in-building risers, strainers, and other custom engineered products.
Asahi/America 
Asahi/America’s features a variety of single and double wall piping systems. We offer single wall systems in polypropylene (Proline) and E-CTFE (Halar-Ultra Proline). Our double wall offerings include Duo-Pro (PP,PVDF & E-CTFE), Poly-Flo (PP & HDPE and Pro-Lock (PVC & C-PVC) engineered solutions. Each of these systems features a full selection of sizes, fittings and pressure ratings.
FEBCO
Designs, manufactures and sells an extensive line of backflow prevention devices including: double check assemblies, reduced pressure assemblies, and vacuum breakers. Also, offers a complete line of irrigation system specialties.
Mueller Steam Specialty
Founded in the early 1900's Mueller is a leading manufacturer of pipeline strainers. Other product lines include: check valves, butterfly valves, suction diffusers, three-way combination valves, and line blinds.
Powers
Manufacturer of water tempering and process control solutions since 1891.
Victaulic Company of America
Since 1925, the world leader in grooved and plain-end mechanical pipe joining systems. Victaulic offers complete, start-to-finish solutions that anticipate a project’s every need. The Victaulic grooved-piping method accommodates most piping materials, including lightwall, standard and extra-heavy duty steel, stainless, aluminum, ABS and other plastics, as well as underground-and waste-treatment process piping. ISO 9001 certified.
Watts 
Since 1874 a leading manufacturer of water safety & flow control products, backflow prevention devices, water quality & conditioning products, specification drainage products, brass & tubular products, control valves, potable PEX plumbing products, Quick-Connect Push Fit Solutions, and Custom OEM Products.
4specs Discussion Forum - Great place to ask questions about specifications, products and technical data. Free - no registration required to read or post (subject to moderation).
See also:
22 1140 - Plastic Piping, Valves and Fittings
23 0570 - Pipe Concealment
23 2140 - HVAC Piping Specialties
Ames Fire & Waterworks
Since 1910 Ames has been a leader in the manufacture of valves and fittings for pipeline systems. Products include: automatic control valves, backflow prevention devices, check valves, in-building risers, strainers, and other custom engineered products.
Asahi/America
Asahi/America’s features a variety of single and double wall piping systems. We offer single wall systems in polypropylene (Proline) and E-CTFE (Halar-Ultra Proline). Our double wall offerings include Duo-Pro (PP,PVDF & E-CTFE), Poly-Flo (PP & HDPE and Pro-Lock (PVC & C-PVC) engineered solutions. Each of these systems features a full selection of sizes, fittings and pressure ratings.
FEBCO
Designs, manufactures and sells an extensive line of backflow prevention devices including: double check assemblies, reduced pressure assemblies, and vacuum breakers. Also, offers a complete line of irrigation system specialties.
Mueller Steam Specialty
Founded in the early 1900's Mueller is a leading manufacturer of pipeline strainers. Other product lines include: check valves, butterfly valves, suction diffusers, three-way combination valves, and line blinds.
Powers
Patented water tempering technology for emergency appliances including eye washes, eye/face washes, drench showers and combination units.
Victaulic Company of America
Since 1925, the world leader in grooved and plain-end mechanical pipe joining systems. Victaulic offers complete, start-to-finish solutions that anticipate a project’s every need. The Victaulic grooved-piping method accommodates most piping materials, including lightwall, standard and extra-heavy duty steel, stainless, aluminum, ABS and other plastics, as well as underground-and waste-treatment process piping. ISO 9001 certified.
Watts
Since 1874 a leading manufacturer of water safety & flow control products, backflow prevention devices, water quality & conditioning products, specification drainage products, brass & tubular products, control valves, potable PEX plumbing products, Quick-Connect Push Fit Solutions, and Custom OEM Products.