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Drainage Glossary: Important Terms to Know


Adjustable Outlet is an outlet that can be raised or lowered determined by amount of threads, typically ½” to 3” in elevation.

Anchor Flange is welded to the bodies of multiple styles of drains and will help with the positioning of the drain to lay flush.  It is generally covered with concrete to secure the drain in place.

Area Drain is a receptor designed to collect surface or storm water from an open area. They are ideal for low to medium flow areas where trench drains or floor sinks may not be necessary.

Bar Grating is used for drains in high traffic and high flow areas. Bar grates are heavy-duty and are forklift rated. They are manufactured using 304 or 316 stainless steel ¼” x 1-1/2” bars on 1” centers, as a standard. We do offer several other options from ½” to 4” tall. 1/8” bars are used when a lighter duty grate will meet your needs.

Bead Blasting is a process where glass beads are applied using low air pressure to create a clean, bright, uniform satin finish.

Blocks are lugs that go all under the grate to make the grate have a flush appearance to the drain, used often for perimeter gap grate.

Butterfly Locking Valve is designed to keep your drains and pipes clear of unwanted debris. When the basket is removed, the drain is closed off.

Catch Basin is a large underground container, with a grate on the top, for collection of water run-off. It catches or collects dirt and other debris, mainly used with trench (trough) drains.

Clamp Device is designed to integrate with the flashing collar (flange), to secure waterproofing membranes when required, and comes complete with stainless steel nuts and bolts.

Cleanout provides access to the drain line for the purpose of clearing an obstruction. They are available in round or square and range in size from 2” to 8”.

Deep Sump Drain is an effective heavy volume drain that is designed for applications with continuous heavy flow and/or debris.

Dome is an enclosure, primarily over StainlessDrains.com roof and parapet drains, which can be made from 304 or 316 stainless steel. It can have any design of slots to allow water to come through.

Double Containment Sanitary Drains are designed to capture condensation caused by extreme temperatures on second floor applications. Double containment drains are used in conjunction with trench drains, catch basins, floor sinks and other drainage systems subject to high heat or extreme cold.

Down Spout Covers are used on a wall where an overflow roof drain concealed leader (pipe) discharges water to the ground. Typical downspout covers are type 304, hinged with a perforated cover.

Eco-Guard™ is used to keep odors, sewer gases and insects from coming up the outlet connections of floor drain bodies.

Electro-polish Finish is a process that smoothes and streamlines the microscopic surface of a metal object, such as 304 or 316 stainless steel. The surface of the metal is microscopically featureless, with not even the smallest speck of a torn surface remaining.

EZ-Stop-Lock is a unique locking mechanism StainlessDrains.com created to secure drain components, which includes pins and a 300 lb magnetic.

Fitting isany part that joins together two sections of pipe. They come in many shapes, sizes and connection styles.

Flashing Collars help secure water-proofing membranes when needed and are available for most drains. They are made from 304 or 316 stainless steel and include nuts and bolts needed when using a clamp device.

Floor Sink is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. It will satisfy any application from light to heavy-duty. They are available in round, square or tapered designs.

Gasket is a flat device, usually made of fiber or rubber, used to provide a watertight seal between metal joints.

Gauge is the thickness of stainless steel.

Grates come in a variety of options, such as perforated, bar, subway bar, perimeter gap, slotted, reinforced and custom logo grates. Grates are available in any load class A-F. Grating over drains are used as filters, to block movement of large particles (such as debris) and to allow movement of small particles (such as water or air).

Gravel Guard is a jagged/notched edge around the edge of a roof drain to prevent gravel from entering the drain.

Hemmed Drain is designed with a grate ledge hemmed inside of the trench. The hemmed trench gives the option of straight up sides or adding a top lip for a highly aesthetic look.

Hemmed Ledge is a ledge seamlessly attached to the inside of a trench drain.

Hinged Grating is a jointed grate that can be used on almost any drain, which can swing open without being completely removed.

Hub Drain is a drain set into the floor that is connected to the drain pipe by means of a hub coupling. The end of the drain flares out like a funnel. This wide section is meant to slip over the end of the drain pipe beneath it. It can be used with/or without a strainer basket. It is used to receive indirect condensate drainage. They are constructed of 304 or 316 stainless steel and are corrosion-resistant.

IAPMO Research and Testing is North America’s premier plumbing and mechanical product certification agency.

I.D. stands for “inside diameter.”

Internal Flanges are designed help reduce splashing caused by large volumes of water at high flow rates.

Internal Splashguard is used mostly on floor sinks.  It’s an added lip/ring inside the floor sink, to be used when rapid flows or water hit the drain, preventing splashing.

Leveling Legs are adjustable stainless steel, double nutted, all-thread rods mounted to bottom of trench drains to allow adjustments to level off the drain.  They may be used with other drains, as well.

Load Classifications

Load Classification

Logo Grates are a new addition to our custom capabilities. We are able to add any custom logo or company name to our slotted, perforated, or perimeter gap grates. Logos are engraved or annealed with a laser or printed in color by our UV printer. Logos will not affect the durability or performance of the grate.

Lugs are stainless steel and welded onto the bottom of grate. There will be a gap between the surface of the grate and the lugs. 

Nelson Studs are large nails that are welded to metal and create a bond between the concrete and steel when concrete is poured on a steel structure.

Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. Pipe size is specified with two non-dimensional numbers: a nominal pipe size (NPS) for diameter based on inches and a schedule (Sched. or Sch.) for wall thickness.

NSF International develops public health standards and certification programs that help protect the world’s food, water, consumer products and environment. As an independent, accredited organization, NSF develops standards, and tests and certifies products and systems. They provide auditing, education and risk management solutions for public health and the environment. StainlessDrains.com has several NSF certified products that can be found here.

O.D. stands for “outside diameter.”

Outlet is the opening or passage by which the liquid is let out of the drain.

Passivation removes free iron and foreign materials from the surface, leaving the stainless steel clean and more corrosion-resistant.  Passivating stainless steel does not change the aesthetics.

Perimeter Gap Grate is a grate that is solid stainless steel and only allows liquid through the perimeter of the grate.

Perforated Grating is applicable for light-to-medium traffic areas. Perforated grates are available with standard round (3/8” holes on ¾” centers) or square (½” holes on 1” centers).

Pickling removes a thin surface layer from the stainless steel using an acid solution. Pickling will create a dull matte uniformed gray finish to the stainless steel.

P-Traps are plumbing fixtures that trap debris that has drained and prevents a deep clog from forming in the plumbing system. They also prevent sewer gases from entering the facility. Ours are made from stainless steel and are highly recommended in lieu of traditional cast iron or plastic p-traps.

Reducer is a fitting that allows pipes of different sizes to be joined together.

Roof Drain is a drain designed to accept rainwater on a roof and discharge it into a leader or downspout. It may include a gravel guard.

Round Floor Sinks are round receptacles located at floor level and are connected to a trap to receive the discharge from indirect waste and floor drainage. They manufactured with high quality stainless steel to satisfy any application from light to heavy duty, proving a cleaner and more sanitary option to traditional floor drains.

Sanitary Drains are manufactured without any inside seams or welds. The outlet is designed as an intricate part of the drain body, to eliminate hidden areas for bacteria growth.

Schedule designation tells you how thick the wall is for any size of pipe, with the higher schedule numbers meaning a thicker wall.

The chart below best describes Schedule 10 and Schedule 40:

Pipe Size

Sediment Baskets and Scoops provide filtering and debris collection for all drain systems.

Shower Drains (linear drains) offer the most sanitary drainage solution, in a contemporary sleek design, and help maintain clean environments due to the corrosion-resistant properties of stainless steel.

Slot Drains is a linear drain used to evacuate ground water.  It take away the need for a grate. The slot drain is an excellent alternative to the standard trench drain. They are suitable for heavy traffic areas, easy to clean and more cost-effective.

Slot Drain/Trunk Line is created by using a round pipe that allows for a deeper invert depth.

Slotted Grating is a very versatile type of stainless steel drain grate and can be used in any application, from light to heavy duty. Slotted grating is available in 12 Ga., 10 Ga., ¼” or ½” plate, using 304 or 316 stainless steel.

Smooth is describing a stainless steel solid plate that will not allow any liquid down the drain.

Specifications of Stainless Steel

TYPE 304. Stainless Steel type 304 is the most versatile and widely used stainless steel. It is still sometimes referred to by its old name 18/8, which is derived from the nominal composition of 304 being 18% chromium and 8% nickel.

TYPE 316Stainless Steel type 316 is an austenitic grade with the addition of 2-3% molybdenum, which further improves resistance to pitting and crevice corrosion.

Subway Grate is several flat bars in a row, the length of the drain, welded onto 2, 3 or 4 round bars depending on the width of the grate.

Tapered Floor Sink allows a positive flow to the outlet without standing water and debris. Available with sediment baskets, sediment cups and many grate options.

Tee is a plumbing fitting in the shape of the letter “T,” used to connect three sections of pipe. It allows the other pipe to be joined at a 90-degree angle.

Threaded Outlet/Female/Male is typically a schedule 40 pipe, threaded inside (female /female adapter) or threaded outside (male/nipple).  It generally is a 150 lb. fitting.

Top Flange is a lip exposed to the top of the finished floor, epoxy, concrete or tiled floor.

Trap Drains are manufactured to capture debris and gases passing through drain systems to prevent clogging and maximize flow. Using built in cleanouts and p-traps are an intricate part of the drain assembly.

Trap Primer is a plumbing device or valve that adds water to traps. The water seals in traps are needed to prevent sewer gases from entering buildings.  In floor drains that are infrequently used, the water is exposed to air and begins to evaporate, leading the release of sewer gases into the environment. The trap primer mitigates this problem by injecting water, either directly or indirectly, into the trap to maintain the water seal indefinitely.

Trench Drain (channel drain) is a specific type of floor drain containing a dominant trough- or channel-shaped body. Characterized by its long length and narrow width, the cross-section of the drain is a function of the maximum flow volume anticipated from the surrounding surface. They are available with a round, square or v-bottom. Trench Drains can be shipped in sections up to 50’, with additional shipping costs. They can be field-welded or flanged to any length required.

Trench L-Angle Drain (Liner) compliments high quality stainless steel formed trench drains.  They are available with round, square or v-bottom channels with nelson studs. Trench drains can be shipped in sections up to 50’, with additional shipping costs, and can be field-welded or flanged to any length required.

UPC (Uniform Plumbing Code) establishes minimum requirements and standards for the protection of the public health, safety and welfare. The UPC includes all potable water, building supply, and distribution pipes; all plumbing fixtures and traps; all drainage and vent pipes; and all building drains, and building sewers, including their respective joints and connections, devices, receptors, and appurtenances within the property lines of the premises and shall include potable water piping, potable water treating or using equipment, medical gas and medical vacuum systems, liquid and fuel gas piping, and water heaters and vents for same.

U.S. FDA Standards are federal guidelines set forth by the U.S. Food and Drug Administration. StainlessDrains.com manufactures its products following FDA guidelines according to CFR Title 21 Part 110, regarding good manufacturing practices. Our manufacturing processes follow all established standards set forth by the FDA for food products.

Weep Holes are small holes that connect to the main drain, allowing water that enters them to feed into the drain pipe.

Wye Fitting is a drain fitting that allows one pipe to be joined to another at a 45-degree angle.


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