Proco Products Expansion Joints & Check Valves

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Proco Products, Inc., founded in 1980 in Stockton, California, manufactures rubber expansion joints, PTFE convoluted joints, and ProFlex check valves for piping and ducting systems. Northern Hydraulics supplies and cross-references Proco expansion joints and check valves, including replacement and equivalent parts for obsolete and superseded series like 220, FFP, and 141/151.

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Proco Products, Inc. is a Stockton, California manufacturer founded in 1980 and still active, building rubber expansion joints and rubber check valves for piping and ducting systems. Its catalog spans molded and spool-type rubber expansion joints, PTFE convoluted joints, ProFlex check valves, flexible hose assemblies, and pipe penetration seals. The company traces its rubber expansion joint heritage to Uniroyal, which invented the rubber expansion joint in 1930, through the acquisition of Protective Coatings assets. Northern Hydraulics supplies and cross-references Proco expansion joints and check valves, including replacement and equivalent parts for obsolete and superseded series.

Cross-Referencing Proco Products, Inc. Parts

Most Proco inquiries we handle are cross-references: an aging expansion joint or check valve in a water, wastewater, HVAC, or process piping line that needs a current equivalent. Proco has superseded several families over the years, and matching the right replacement by face-to-face dimension, arch profile, flange drilling, and elastomer is what keeps a system tight. Send us the legacy Proco part number or a photo of the nameplate, and we will identify the active series and the equivalent part.

Documented interchange paths matter here. Series 220 was replaced by Series 230; Series FFP was replaced by Series 251/BT; Series 141, 151, and 220 were consolidated into Series 221; and the molded spherical Series 240/242 was designed as a direct replacement for metallic expansion joints. If your part is discontinued or the markings are worn off, we can work backward from the application. Request a Proco cross-reference quote to get the equivalent part identified.

Proco Products, Inc. Product Lines & Series

Proco’s catalog is organized into expansion joints and ProFlex check valves. We cross-reference and supply replacement and equivalent parts across these families:

Rubber expansion joints — Series 230 (spool-type wide arch), Series 233-L/234-L (large lateral offset), Series 240/242 (molded spherical), Series 260R (wide-arch low spring rate), and Series 271 (spool-type super wide-arch)
PTFE-lined joints — Series 251/BT convoluted expansion joints for aggressive chemical service
Reducers — Series RC and RE concentric and eccentric reducing expansion joints
ProFlex check valves — Series 700 duckbill check valves, including Styles 710, 710TT, 711, 720, 730, 730M, 730CBD, 731, 740, 750, 770/780, and 790
Flexible hose assemblies and pipe penetration seals for connecting and sealing piping and ducting runs

Have a worn or discontinued joint or valve from any of these families? Send us the details for a Proco cross-reference and we will return the active equivalent.

Proco Products, Inc. — Frequently Asked Questions

Is Proco Products, Inc. still in business?

Yes. Proco Products, Inc. is an active manufacturer founded in 1980 and headquartered in Stockton, California. It continues to produce rubber expansion joints, PTFE convoluted joints, and ProFlex check valves.

What’s the equivalent to a discontinued Proco Products, Inc. part?

It depends on the original series. Proco’s documented interchange paths include Series 220 replaced by Series 230, Series FFP replaced by Series 251/BT, and Series 141/151/220 consolidated into Series 221. We can match your legacy part to the active equivalent — send us the part number for a Proco cross-reference.

Does Northern Hydraulics sell Proco Products, Inc. parts?

Northern Hydraulics supplies and cross-references Proco Products expansion joints and check valves, including replacement and equivalent parts. We are not described as an authorized distributor; we identify the right current part and source it for your application.

Can you cross-reference an obsolete Proco Products, Inc. part?

Yes. Obsolete and superseded Proco joints and valves are our specialty. Give us the legacy series, face-to-face dimension, and flange drilling — or a nameplate photo — and we will return the active equivalent. Start an obsolete Proco cross-reference.

What does Proco Products, Inc. manufacture?

Proco makes rubber expansion joints and rubber check valves for piping and ducting systems, along with PTFE convoluted expansion joints, flexible hose assemblies, and pipe penetration seals.

Can the Series 240/242 replace a metallic expansion joint?

Yes. Proco’s molded spherical Series 240/242 was designed as a replacement for metallic expansion joints, absorbing movement and vibration where a rigid metallic joint had previously been used. Ask us to spec a Series 240/242 equivalent.