Shop a wide range of protective parts to prevent damage to fittings, valve, pipe ends, hoses and more.

Hydraulic & Pneumatic Parts

Solutions for Hydraulics from Caplugs

Caplugs offers a full line of parts to protect hydraulic and pneumatic components and fittings during shipping, storage and finishing processes. From threaded caps and plugs to hose protection and service plugs, Caplugs offers parts to securely protect delicate threads and prevent any contamination or damages.

Our hydraulic fitting and component protection is designed for the industry's most common fittings and applications, including:

  • SAE
  • NPT
  • UN/UNS
  • British Standard
  • Flared and Flareless
  • Flanges
  • Valves
  • JIC
  • Pipe Ends
  • High-Pressure Hoses
  • O-Rings and Gaskets

Find protective solutions designed to withstand tough applications and offer protection for your hydraulic and pneumatic equipment in the most difficult working conditions at Caplugs.

Discover Products for Hydraulics Applications

Threaded Caps
Threaded Plugs
Pull Tab Caps
Hose Protection
All Hydraulic Parts
Hydraulic Service Plugs

PTSP Series Service Plugs

Make maintenance and repairs simple and quickly plug rigid hoses and pipes with service plugs from Caplugs. Find and order yours today!

PTSP Service Plugs

View the Hydraulics Catalog

Many customer challenges can be solved with standard catalog parts. Explore the hundreds of sizes and geometries available for aviation customers.

Hydraulics Spiral Wrap
Hose Protection

Protect hydraulic hoses from damage and wear

Caplugs offers a full line of hose protection parts to protect the lifespan of your critical connections. Choose from Pig’s Tail or Safeplast brands of spiral wrap and find the right hose protection solution for any application or environment. Manufactured at our headquarters in Buffalo, N.Y. under our stringent ISO-certified quality management system, we ensure consistent, high-quality products and rapid delivery of the protection you need for your hydraulic lines.

Explore Hose Protection Parts

Military & NAS Specifications

The following Caplugs parts are in accordance with the corresponding specifications. Click the series links for detailed product information.

MS90376 and AS90376 have been superseded and replaced by SAE AS 85049/138


All statements, technical information, and recommendations related to Caplugs products are based on information believed to be reliable, however, the accuracy or completeness is not guaranteed. Before using any Caplugs product you must evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated with such use. Any statements related to the product which are not contained in Caplugs current publications, or any contrary statements contained on your purchase order shall have no force or effect unless expressly agreed upon, in writing, by an authorized officer of Caplugs.

Spec Number
NAS 831
NAS 832
NAS 833
NAS 834
NAS 835
NAS 836
NAS 837
NAS 838
NAS 839
NAS 840
NAS 841
NAS 842
NAS 843
NAS 844
NAS 845
NAS 846
NAS 847
SAE AS85049/138
Custom Solutions

Streamlined Customization for Hydraulics

Can’t find a catalog part that meets your needs? Let our in-house team of design engineers work with you on a custom solution. We work one-on-one with you to learn about your part and protection needs and creating a component that solves your issue. Our comprehensive process will take your part from concept and design to prototype and full-volume production and deliver a part that meets your dimensional, environmental and operational requirements.

Concept Design

Dedicated technical sales specialists and engineers assigned to each project will design solution options with 3D modeling, compatible with all CAD platforms.

Rapid Prototyping

Prototypes built in-house confirm fit requirements before production approval.

In-House Tool Fabrication

Molds made in house for greater process control, shorter lead times and easier modifications.

Full Production Capability

From small volume runs to millions of parts.

PPAP and FAIR Compliance

Formal verification that part design and production processes comply with all your specifications, including chemical and physical analysis and full lot traceability.


We can meet special requirements like polybagging and corrugate-free.

Inventory Management

We can inventory parts for JIT, Kanban and other warehousing requirements.


Request a Quote

When you need a custom protective part for a unique need, let the largest, most experienced in-house team of design engineers develop it for you from initial design to final production. We offer extensive custom molding solutions to meet your cost, performance, and production requirements

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