WHK's Caps and Bottle Stoppers Are Top of the Line at a Reasonable Price.

When you're putting together manifold assemblies for your biopharm and lab projects, quality counts. You need caps and bottle stoppers that you can rely on, time after time, every time, but at a price that won't break the bank. That's WHK.

Our stoppers are made out of the same TPE as our tubing. After all, like materials have the best bonding strength.  And since our stoppers are made out of the very same material as the tubing, there's no need for any additional material validations. Our stoppers are the only ones on the market that have strain reliefs on the top to keep tubing from kinking.  They're all molded and assembled in our ISO Class 7 Cleanroom, made right here in Clearwater, Florida, USA. 

Our caps are available in the three most popular sizes, 38mm, 45mm, and 53mm.  They are available in white, red or clear and come in four different package sizes of 6, 12, 50 or 100 caps. Other colors are available by special order. Our non-sterilized caps are generally available for next business day shipment for orders up to 500 (Contact us for pricing and availability on our sterilized caps). Our bottle stoppers come in the same three popular sizes.  

Tubing lengths are customizable.  So are assembly accessories, including clamps, filters, plugs and caps.  We place a V-notch on the bottom of the end of the tubing to make sure that the entire contents of the bottle are sucked out.  We can deliver the caps with the stoppers already inserted, if desired.  Custom packaging is available.    

What Tubing is Used to Make Our Stoppers?

Our WHK Class VI bioparmaceutical tubing is used in all of our bottle stoppers. It meets all biopharmaceutical requirements.  It's flexible, sterilizable, weldable and moldable.  It's Gamma and ETO compatible, silicone oil-free, meets USP <88> Class VI, is UV protected, animal derived component free (ADCF), Phthalate-free, BPA-free, REACH and RoHS compliant, as well as ASTM and ANSI compliant.  

Manifolds and Assemblies in Weeks, NOT Months!  

Tired of being told lead times of 14 to 16 weeks for your manifolds and assemblies?  Depending on complexity, quantity and availability of parts, our lead times are usually between 4 to 8 weeks from receipt of P.O. and final approval of drawings. 

Sounds Great, What’s the Next Step?

Want to reduce of the costs of your assemblies?  Send us a drawing and we’ll respond promptly with a ‘no-obligation’ quote. Have a new project in the works?   We’re ready when you are. 


Want more information?  Call us at 855-WHK-BIO1 (855-945-2461) or (727) 209-8404 or e-mail us here.

Want a FREE SAMPLE of our Caps and Stoppers?  Click Here.