The CPS AVT45 is a brass T adapter with 1/4 in SAE male, 1/4 in SAE female knurl, and 1/4 in SAE male connections. CPS lists it as an access fitting made for digital vacuum gauges.
CPS AVT45 at a Glance
The AVT45 is built for vacuum gauge work where a compact three port adapter is needed. CPS names it as a brass “T” adapter and identifies it as part of its access fittings line. The official CPS product page shows the model as AVT45 and gives the connection style as 1/4 in SAE M x 1/4 in SAE female knurl x 1/4 in SAE male.
For technicians, the main value of this fitting is simple. It provides a way to connect or adapt lines in a vacuum gauge setup without changing the basic SAE size standard. CPS also places the AVT45 in the same product area as its access fittings and adapters, which makes its intended use clear.
Product Specifications
| Specification | Details |
|---|---|
| Brand | CPS Products |
| Model | AVT45 |
| Product type | Brass T adapter / access fitting |
| Connection style | 1/4 in SAE male x 1/4 in SAE female knurl x 1/4 in SAE male |
| Intended use | Digital vacuum gauges |
| SKU | avt45 |
| Product family | DEL access fittings and adapters |
Connection Type and Fit
The AVT45 uses standard 1/4 in SAE connections. That matters because matching thread type is one of the most important parts of a proper fit. If the connection size or thread style does not match, the fitting may not seal correctly, and the setup can leak. CPS identifies all three ports in the same SAE 1/4 in size, which keeps the fitting easy to use in matching systems.
The female side uses a knurl nut. A knurl nut gives a technician a better grip when tightening by hand. That design is useful in service work where access can be tight and tools are not always convenient to use. CPS names the part specifically as a “female knurl” version, which distinguishes it from the AVT44, a similar model that uses a female hex nut instead.
Main Use in Vacuum Gauge Work
CPS states that the AVT45 is a brass T adapter for digital vacuum gauges. That direct description tells you the part is meant to sit in a gauge connection path rather than act as a general purpose plumbing fitting. In practice, this makes it useful when a technician needs to connect a gauge and maintain a clean and organized line layout.
The AVT45 also appears as a replacement part on the CPS VG100A digital vacuum gauge page. CPS lists it with the note “1/4˝ SAE female knurl nut x 1/4˝ SAE male x 1/4˝ SAE male w/cap & core.” That link to the VG100A page shows the part belongs in the CPS vacuum gauge ecosystem and is not just a stand alone accessory with no defined use.
AVT45 and Related CPS Parts
The CPS VG100A page lists three related replacement parts in the same section. Those are AVT44, AVT45, and AVT87. The AVT44 uses a female hex nut, while the AVT45 uses a female knurl nut. That difference is small, but it matters in real service work because the grip style changes how the technician handles the fitting.
The AVT45 is therefore best understood as one member of a small CPS adapter group. Its core job is not to add a new function. Its job is to match the gauge and line connection style that the system already needs. That is why the part is listed as a replacement item for the VG series rather than a separate tool category.
Pack Size and Listing Differences
One point that buyers should check is pack size. The official CPS product page describes the AVT45 and gives its SKU and connection style, but it does not show a pack count in the text shown on the page. Some reseller listings do show the AVT45 as a 3 pack. That means the pack count can depend on the seller, not only on the model number.
For example, Test Equipment Depot lists the AVT45 as a “3 Pack” and includes “3 Connectors” in the included items section. Global Test Supply also describes the AVT45 as a pack of 3. Those listings support the idea that many retail offers are bundled, even if the official CPS product page itself does not clearly state the quantity.
Why the Female Knurl Design Matters
The female knurl nut is one of the most practical parts of this fitting. Knurling gives extra surface grip. That helps when a technician needs to tighten or loosen the fitting quickly by hand. In field use, that can save time and make the connection easier to manage in tight spaces. CPS uses this design in the AVT45 specifically, which shows the part is aimed at hands on service work.
This design also helps separate the AVT45 from the AVT44. The AVT44 uses a hex nut instead of a knurl nut. For technicians who prefer finger grip over wrench grip, the AVT45 is the more suitable version. That difference is small on paper, but it can matter during frequent use.
Compatibility Notes
The AVT45 uses 1/4 in SAE threading on its ports, so compatibility depends on matching SAE fittings. The part is not described by CPS as a universal adapter for every hose or gauge. Its official description is specific to digital vacuum gauges, which means it should be selected with the intended system in mind.
Because CPS also lists the AVT45 as a replacement part for the VG100A gauge, it is reasonable to treat that gauge family as a strong compatibility reference. That does not mean the fitting works only there, but it does show the intended environment for the part.
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Buyer Checklist
| Check point | What to verify |
|---|---|
| Thread size | Make sure your system uses 1/4 in SAE connections |
| Grip style | Choose knurl nut if hand tightening matters more than hex nut grip |
| Use case | Confirm the part is for a digital vacuum gauge setup |
| Quantity | Check seller listing for single unit or 3 pack packaging |
| Replacement needs | Compare against AVT44 and AVT87 if you need another CPS adapter style |
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What the Official CPS Listing Shows
CPS makes three things clear on the official AVT45 page. The part number is AVT45. The fitting is a brass T adapter. The connection style is 1/4 in SAE male, 1/4 in SAE female knurl, and 1/4 in SAE male. Those are the core facts that define the product.
The page also places the fitting in the DEL access fittings and DEL adapters categories. That helps confirm that it belongs in a line of service fittings rather than in a general hardware or plumbing range.
Common Search Terms for This Part
Buyers and technicians often search for the AVT45 using slightly different wording. The official and reseller pages show versions such as “1/4 in SAE male x 1/4 in SAE female knurl x 1/4 in SAE male brass T adapter,” “1/4 in SAE female knurl x 1/4 in SAE male,” and “1/4 in SAE M x 1/4 in SAE F Knurl x 1/4 in SAE M.” These variations all point to the same CPS model number, AVT45.
Using the model number AVT45 is the safest way to identify the part, because the wording can change from one seller to another while the model stays the same.
Technical Summary
The CPS AVT45 is a simple but useful brass adapter for vacuum gauge work. It has a 1/4 in SAE male end, a 1/4 in SAE female knurl end, and another 1/4 in SAE male end. CPS lists it as an access fitting for digital vacuum gauges and also shows it as a replacement part in the VG100A vacuum gauge line. Some sellers list it as a 3 pack, so buyers should confirm the quantity before ordering.
