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Wil Spindler
Bart Mann
We could go into a big long description of our Standard and High-Temp, Split Type and Flange Type composition rings, but we'd rather have you call us for the technical bulletin, or simply download a copy of it to the right.

What we really want to tell you about are our Yellowjackets®. When we put the first one together, it looked like a really long bee...hence the name. Now that we have that over with, why should you consider using yellowjackets on your plunger? They convert your existing Martin-style plunger into pressure actuated technology. The exclusive groove design expands on the upstroke and contracts on the downstroke to effect a free-falling plunger. Yellowjackets are easier to install - no pre-swelling and rolling down.

Like we said before, we're producers. We like to make things as easy on ourselves as is humanly possible.

click here to download the
current technical bulletin.
Darcova's Nylon®
Darcova's Teflon® Based
XT® Yellowjacket
Valve Cups
Seating Cups
Pressure Actuated
TefCore & Veetex
Stuffing Box Components
About Us
Pump Components
& Gaskets

DARCOVA & The Dragon • (800) 327-2682 • (800) 372-4661 • Phone (406) 254-9399 • FAX (406) 254-9446
514 Foote Street • Billings, MT 59101
© 2017 Darcova Inc.,