McKillans 3/8" NPT Female Automatic Quick Connect Couplers - Stainless Steel, Viton O-Rings, 2-Pack

These are stainless-steel, push-to-connect 3/8" NPT female automatic quick connect couplers designed to convert NPT pressure-washer hoses into fast, one-handed connections.

Replace threaded hookups with an automatic quick-connect system that locks on contact and resists corrosion for dependable, leak-minimizing performance. The McKillans kit contains two machined stainless-steel 3/8" NPT female automatic couplers built with upgraded Viton O-rings and engineered for smooth, long-lasting operation on compatible NPT pressure-washer hoses.

Will these fittings work with my pressure washer hose?

If your hose uses a 3/8" NPT threaded connection, these couplers will fit. They do not adapt to M22, 14mm, or 1/4" quick-connect accessories, so confirm the thread standard before ordering to avoid incompatibility.

• Fits only 3/8" NPT pipe thread—verify thread size on your hose or wand.
• Not compatible with M22 or 14mm hose connections.
• Does not fit 1/4" quick-connect spray tips or foam cannons.

How do I attach and detach these automatic couplers?

Attachment is simple: push the male plug into the coupler until it seats and locks automatically. To release, pull back the sleeve as you would with standard push-to-connect designs; the self-locking mechanism enables quick one-handed swaps without tools.

• Push-to-connect design enables fast, tool-free connections.
• Self-locking mechanism keeps the joint secure during use.
• Sleeve release allows quick separation when needed.

What materials and seals are used to ensure reliability?

Each coupling is precision-machined from stainless steel for enhanced corrosion resistance and a smooth mating surface that reduces wear. The O-rings are made from Viton, chosen for its superior resistance to chemicals and high temperatures compared with common elastomers.

• Stainless-steel bodies resist rust and provide sturdy, long-term service.
• Viton O-rings improve leak resistance and longevity under stress.
• Machined surfaces minimize friction for consistent operation.

What comes in the kit and is there warranty coverage?

The package includes two 3/8" NPT female automatic couplers—one for each end of an NPT hose you want to convert. McKillans backs these fittings with a one-year residential warranty, reflecting a commitment to product quality and customer support.

• Kit contents: two 3/8" NPT female automatic couplers for hose upgrades.
• Specification: 3/8" NPT female to 3/8" quick-connect female interface.
• Includes a 1-year residential warranty for purchaser peace of mind.

Who is this for? If you own pressure-washing equipment with 3/8" NPT threaded connections and want faster setup, reduced leakage, and a more durable coupling than standard fittings, this McKillans stainless-steel push-to-connect kit is tailored for you. It’s ideal for homeowners, detailing professionals, and anyone who prefers quick, single-handed swaps and corrosion-resistant hardware—so long as your hose thread is 3/8" NPT. Avoid purchase if your system uses M22, 14mm, or 1/4" quick-connect standards.