CAPLUG (P/N pde-6) - New Surplus

The pde-6 is a molded polymer protective plug for 3/8 inch flareless tube-and-nut assemblies with 9/16-18 thread. Designed to fit MS21921-style fittings, this cap seals hydraulic line ends against dust and moisture during storage, shipping, and maintenance operations. Installation requires only finger-tightening via the knurled grip, with removal following standard shop procedures.

Essential for protecting flareless fitting threads and sealing surfaces in aircraft hydraulic systems during non-operational periods.

What is the CAPLUG (P/N pde-6)?

The pde-6 is a molded polymer protective plug for 3/8 inch flareless tube-and-nut assemblies with 9/16-18 thread. Designed to fit MS21921-style fittings, this cap seals hydraulic line ends against dust and moisture during storage, shipping, and maintenance operations.

Is the pde-6 compatible with my aircraft's avionics suite?

Avionics compatibility depends on your aircraft model and existing installation. The CAPLUG is available in: New Surplus. We recommend checking your aircraft's wiring diagrams and STC documentation, or contact our avionics team for compatibility assistance.

Does the pde-6 come with an 8130-3 airworthiness tag?

Availability of an FAA 8130-3 tag depends on the part condition. Overhauled and repaired units typically include 8130-3 documentation. As-removed units may include a removal tag with trace history. Contact us for specific documentation on the condition you need.

Do you offer bench testing for the pde-6?

We can arrange bench testing through our network of FAA-certified repair stations. Call (904) 998-9101 for testing availability and turnaround times, or submit an RFQ with your specific requirements.