Elasto-Valve Rubber Products offers duckbill check valves in the following configurations: Series CPO slip-on, Series CPJ jacket, Series CPI in-line, and Series CPF flanged. Series CPO slip-on check valves are tough enough to endure abrasive slurries, they're designed to withstand wear, and they will seal around solids. These sensors feature a back-flow prevention design, no moving parts, zero maintenance issues, and an extremely quiet operation. They are designed to handle abrasive/corrosive materials, and they have inside diameters ranging from 1/2" to 54" and lengths ranging from 2-1/2" to 74".

Pneuline Supply Inc. offers the following duckbill check valve configurations: QCD polycarbonate, CNV tubing, CDV acrylic check, and ASD ball. Model CNV valves are made for tubes ranging from 1/16 to 5/32 ID, and they have cracking pressures 3" off the water column. These valves are constructed from polypropylene, epichlorohydrin, and EPDM materials.

Tideflex Technologies duckbill check valves in a variety of configurations, including: Series TF-2 slip-on/flared, Series TF-1 slip-on/flat, Series 37 flanged/integral, Series 35-1 flanged/flat, and Series 35 flanged/flared. Series TF-1 slip-on/flat bottom check valves have 1"-2" cracking pressures, diameters ranging from 4" to 102", and curved bills for enhanced sealing around debris. These valves feature a 100% elastomer construction, minimal bottom clearance, and reliable backflow prevention. They will not warp, corrode, freeze open, or shut. Other valve configurations offered by Tideflex include: Series OSV overflow security, Series 39F flanged large diameter, Series waterflex flanged clean water, Series 37G thimble insert flanged, etc.

Onyx Valve Co. offers self-contained, external, and internal duckbill check valves. Flanged fully enclosed duckbill check valves feature carbon steel fabricated enclosures, inner pipeline backflow prevention, and no mechanical parts. These valves are able to ensure the mono-directional flow of sludge, sewage, slurries, and hard to handle fluids. They come in sizes ranging from 14 to 60.

Industrial Specialties Mfg. offers CVT Series, CVDB Series, and IS Series duckbill check valves. CVT Series valves have 1/8" non-barbed connections, white silicone bills, and clear acrylic bodies. CVDB Series valves have barbed hoses ranging from 1/8" to 3/16", silicone duckbills, and polypropylene, polycarbonate, Kynar, and nylon materials. IS Series valves have cracking pressures up to 0.112 PSI and polycarbonate bodies.

Aims Fasteners & Fittings offers standard, reducing, and enlarging duckbill check valves. These valves hold pressures ranging from 0.5 to 150 PSI, they come in 1/8" and 3/16" sizes, and contain sharp seal points. They feature silicone valves with polycarbonate, Kynar, polypropylene, and Nylon material options.

General Rubber Corp offers slip-on duck bill check valves for submerged outfall diffusers and storm water outfall/overflows. Model 4100 slip-on duck bill check valves are manufactured with integral reinforced cuff ends, and they have lower head loss than conventional check valves. These valves feature a versatile construction, excellent corrosion/abrasion resistance, a maintenance-free operation, and a rugged all-elastomer construction. They eliminate backflow/seals around entrapped solids and will open with as little as 1" W.C.

J & S Valve offers HedFlex check valves. Model DBV-09-FSI check valves come in sizes ranging from 1" to 96", and they are designed to insert into a pipe and bolt between two flanges. These valves are constructed from superior grade polyester/rubber reinforcement for the improvement of life expectancy, operation, and performance. There are a variety of rubber grade options available.

Red Valve Co./Tideflex Technologies offers Tideflex check valves for the following applications: outfall lines, sludge pumping, equalization basins, booster stations, pump/lift stations, etc. These valves feature a 100% rubber construction and a unique duckbill shape. They can be secured with ANSI flanged, slipped onto/into existing pipes, connected with thimble plates, or a variety of other customizable options.

Ark-Plas Products, Inc. offers duckbill check valves. These plastic valves are constructed from "flow-through" silicone, they have small diameter bodies, low-pressure capabilities, and are sensitive to flow/pressure fluctuations.

Vernay offers duckbill check valves. These valves feature free flows with positive differential pressures, a one-piece elastomeric construction, precision-molding, and can operate in several hundred kPa of water. Valves can be installed easily installed, easily sealed, and will prevent backflow leakage when minimal pressures are applied.

Elder Rubber Co. offers duckbill check valves. These valves are available as pre-loaded, they range in size from 0.1" to 1", and they operate in ranges from just a few inches all the way up to several hundred PSI. Valves have the following compounding capabilities: polyacrylate acrylic, styrene-butadiene, polyurethane, chloroprene, epichlorohydrin, polyisoprene, butyl, silicone, ethylene propylene, nitrile, etc.

DJ Gongol & Associates offers duckbill check valves in the following range of materials: Viton, chlorobutyl, Hypalon, Buna-N, EPDM, neoprene, and pure gum rubber. These valves are self-sealing, non-slamming, quiet-operating, and corrosion-resistant. They have applications for water-mixing systems, floor drains, anti-siphon installations, overflow vents, waste-water treatment plants, storm-water outlets, river outfalls, etc.

Frank Olsen Company offers flanged end, slip-on, and inline duckbill check valves. Style 710 ProFlex rubber check valves range in size from 1" to 72", they range in length from 4" to 98", and they have flange OD's ranging from 4.25" to 86.50". These valves feature an all-rubber construction, a quiet operation, an anti-backflow design, and non-warping/freezing capabilities. They have operating temperature of up to 250°, and they are constructed from Viton, neoprene, Nitrile, EPDM, chlorobutyl, and Hypalon materials.

Mid-Atlantic Valve & Equipment offers flanged end, slip-on, and inline TideFlex duckbill check valves. These valves feature strongly engineered spines for long-term performance, and the duckbill design is curved so that can return to a closed position every time.