Parker CPI Single-Ferrule Tube Fitting Cross-Reference to Crestflo Equivalents

A Parker CPI cross-reference takes a Parker CPI™ single-ferrule instrumentation compression tube fitting and maps it to the dimensionally interchangeable Crestflo equivalent you specify and buy in its place. Crestflo builds single-ferrule instrumentation tube fittings engineered to the Parker CPI dimensional envelope. They're qualified to ASTM F1387. Materials run from 316/316L through exotic alloys, and sizes come in both imperial and metric.

CPI here means Parker's instrumentation single-ferrule compression tube fitting for fluid and gas systems, not chemical-process-industry (CPI) as a sector, and not a plumbing compression fitting.

CPI™ belongs to Parker Hannifin Corporation as a registered trademark. Crestflo builds interchangeable equivalents on its own, with no ties to Parker Hannifin, no authorization from them, and no endorsement either. Genuine Parker parts aren't something Crestflo sells.

Need a Parker CPI cross-reference? Send over your part list or BOM, and the Crestflo engineering team will send back the matching equivalents along with an RFQ. Request a quote.

Parker CPI Interchange Is Also Called a Cross Reference, Equivalent or Conversion Chart

Buyers land on this mapping through several different phrasings, but it's always the same relationship: a Parker CPI part and its Crestflo counterpart. People specify it as a Parker CPI cross reference, cross-reference chart, interchange chart, conversion chart, equivalent, replacement, or drop-in. Reversed word orders show up too, things like "cross reference Parker CPI" and "CPI Parker cross reference." The brand itself gets referenced under a handful of names as well: Parker CPI, CPI fittings, Parker CPI tube fittings, Parker instrumentation fittings, and Parker Fluid System Connectors. All of these trace back to Parker Hannifin Corporation. Part-number lookups such as "parker cpi part number cross reference," along with PDF-specific searches like "parker cpi cross reference pdf" and "parker cpi cross reference chart pdf," all resolve to one request in the end: find the Crestflo equivalent for a given Parker CPI item.

What Is a Parker CPI Fitting? The Single-Ferrule Instrumentation Compression Design

Parker Hannifin's CPI™ fitting is a single-ferrule instrumentation compression tube fitting built for gas and liquid systems. Three parts make it up: a body, a nut, and a single ferrule that swages onto the tube's outside diameter to grip and seal. Within Parker's instrumentation tube-fitting range, it's the single-ferrule option. Crestflo makes a single-ferrule fitting built on that same design principle, plus double-ferrule versions. That means a buyer switching over from CPI can match the single-ferrule format without any guesswork.

Parker CPI vs A-LOK: Single Ferrule Versus Twin Ferrule

Parker CPI uses a single ferrule. Parker A-LOK®, by contrast, is a twin-ferrule (double-ferrule) instrumentation tube fitting from Parker. These aren't interchangeable on the same envelope, so confirm which one you're holding before attempting a conversion. If you're working with A-LOK twin-ferrule parts, start with the Parker A-LOK cross-reference. To understand the design difference itself, see single vs double ferrule explained.

How the Parker CPI to Crestflo Interchange Works: Single-Ferrule Geometry & Thread Parity

A single-ferrule fitting seals through a defined geometric envelope: tube outside diameter, ferrule profile, nut thread, body bore. Match those dimensions, and two fittings interchange; the assembly grips and seals on the same tube. Crestflo builds its single-ferrule fittings to the Parker CPI dimensional envelope and verifies performance against ASTM F1387. The result: a Crestflo body, nut, and ferrule make up onto your existing tube just as the original does.

The match here is dimensional, not functional, so the right terms are interchange and equivalent. Never compatible. Never intermix. Don't mix components across brands within a single made-up connection. The Crestflo equivalent carries the tube's rated working pressure for the given OD and wall, per the applicable standard; Parker CPI pressure rating values follow that same standard and can be adjusted to fit the requirement. Interchange covers imperial (fractional) sizes and metric sizes alike, up to 2" (50 mm) OD. Before converting, always check the specific part against your actual service conditions.

Request Your Parker CPI Part-Number Cross-Reference Chart

Crestflo validates equivalents part by part rather than relying on a fixed public part-number table, so the mapping reflects your actual Parker CPI designations, sizes, alloys, and end connections. Parker's CPI part-number format follows a pattern built from a size code, a connector type, and a material suffix. Send in your Parker CPI catalog part numbers or your BOM, and the engineering team matches them against the Parker CPI fitting catalog designations. You'll get back a same-part interchange chart along with an RFQ. To cross-reference several brands at once, Swagelok, Parker A-LOK, Hoke, Fitok, DK-Lok and more are covered by the master multi-brand interchange chart or the cross-reference lookup tool.

Parker CPI Configurations Cross-Referenced: Connectors, Unions, Elbows, Tees & Ferrules

Within the instrumentation scope, every Parker CPI configuration has a matching single-ferrule equivalent from Crestflo.

Every configuration swaps in and out on the same ASTM F1387 compression-tube-fitting basis. Take a look at Crestflo's full single-ferrule tube fitting range.

Parker CPI Sizes & Threads: Fractional 1/8"–2", Metric 3–50 mm, NPT, BSPP & Weld Ends

Crestflo lines up with the Parker CPI size and end-connection envelope in both measurement systems. Tube OD and thread dimensions come straight from the standard published values: ASME B1.20.1 governs NPT, while BSPP/BSPT and metric OD tables cover the rest. Figures track the applicable standard, but they're customizable when requirements call for it.

Ferrules come hardened or non-hardened, depending on what the job calls for. Crestflo offers both metric and imperial-fractional sizes across every fitting.

Parker CPI Fitting Alloys: 316/316L Stainless Through Hastelloy, Inconel, Monel & Duplex

Where Parker CPI stock typically runs 316 stainless, Crestflo interchange covers the whole corrosion-resistant-alloy range. That's a core differentiator for sour, cryogenic, offshore, and high-halide service.

Also on offer: 304/304L, 904L, AL-6XN, Alloy 20, Inconel 600/601/718/825, Incoloy 800/800H, Monel K500, Hastelloy C-22/B-2/B-3/X, and Nickel 200/201. The UNS designations follow standard published values. Availability covers instrumentation fittings, valves, and tubing only; Crestflo doesn't supply bar, sheet, plate, or mill products. Where specified, alloys are supplied NACE MR0175 / ISO 15156 compliant.

ASTM F1387: The Standards-Based Proof Behind a Parker CPI Interchange Claim

An interchange claim is only as good as its proof. Crestflo puts its single-ferrule tube fittings through ASTM F1387, the performance standard for compression tube fittings: hydraulic proof, burst and impulse pressure, pull-out, vibration, and thermal-cycling tests. That's not a line from a brochure. It's the objective qualification that backs the Parker CPI-to-Crestflo interchange.

Values follow the applicable standard and can be adjusted to fit your requirements. For details, see the ASTM F1387 standard page, NACE MR0175, ISO 15156, EN 10204 MTC, and traceability pages. Crestflo holds ISO 9001, 14001, and 45001 certification, along with PED certification.

Request Your Parker CPI Cross-Reference & Interchange Quote

Send us your Parker CPI part list or BOM. We'll put together a same-part interchange chart and turn around an RFQ. Reach the Crestflo engineering team at sales@crestflousa.com or +1 346 594 9005, based in Houston, TX.

• Request a quote, same-part Parker CPI equivalent RFQ
• Request a sample, validate the fit before you convert
• Cross-reference lookup tool, check equivalents online
• Parker CPI alternative, the switching case, feature by feature

Datasheets and CAD models are available to customers on request.

Why Crestflo for Parker CPI Interchange

Crestflo is the instrumentation division of an export house with four decades under its belt and formal recognition from the Government of India, now serving US buyers through a drop-in interchange program that's built on capability, not stock claims:

• ASTM F1387-qualified single-ferrule fittings, the objective interchange proof few competitors publish.
• Imperial and metric sizes on every fitting, matching the Parker CPI envelope in tube OD to 2" (50 mm).
• Exotic-alloy depth: 316/316L, Hastelloy, Inconel, Monel, Duplex, and Titanium. That's more than most distributors keep in stock.
• Heat-number traceability on every part with EN 10204 3.1 MTC (3.2 on request).
• Small MOQ and private label, plus a post-tariff cost advantage for US buyers.
• Ready stock on standard items, made-to-order for specials, 6-8 week delivery, details on lead time.
• Indian origin, with US or European melt available on request, backed by full material traceability, see US-origin compliance. Crestflo stands behind every batch.

We Engineer Confidence.

Frequently Asked Questions About Parker CPI Cross-Reference

Related Cross-References & Resources

• Cross-reference hub
• Parker CPI alternative
• Parker A-LOK cross-reference
• Master multi-brand interchange
• Single vs double ferrule explained
• Single-ferrule tube fittings
• ASTM F1387 standard