Lasco 448015 (448-015) Schedule 40 PVC Cap – 1-1/2" Female Pipe Thread (FPT/FNPT) – White

The Lasco 448015 is a Schedule 40 PVC female threaded cap designed to seal off the end of a 1-1/2" male NPT fitting. It’s commonly used on pool/spa plumbing, irrigation manifolds, and general water systems where you need a removable, threaded closure for a port, clean-out, or future expansion point.

Key Features

• Part Number: 448015 (also shown as 448-015)
• Type: Threaded PVC cap
• Size: 1-1/2"
• Connection: Female NPT (FPT/FNPT)
• Material: Schedule 40 PVC
• Color: White
• Use: Seals a 1-1/2" male threaded fitting or port

Common Uses

• Capping a threaded port on pool/spa plumbing manifolds
• Creating a removable clean-out or winterizing point
• Sealing a future takeoff on irrigation headers and equipment pads

Compatibility Notes

• Thread type: Designed for standard tapered NPT male threads (1-1/2" MPT).
• Not a slip fitting: This cap does not glue onto pipe; it threads onto a male adapter or male threaded fitting.
• Do not over-tighten: PVC female threads can split if forced.

Related Products

• 1-1/2" PVC Male Adapters (MPT x Slip) (convert a glued line to a threaded connection for this type of cap)
• 1-1/2" PVC Threaded Plugs (MPT) (alternative way to close a female threaded port)
• PTFE Thread Tape (helps seal NPT threads)
• Thread Sealant for Plastic Threads (use a non-hardening sealant compatible with PVC)
• 1-1/2" PVC Unions (adds serviceability near capped ports or equipment)
• 1-1/2" PVC Ball Valves (control flow if the capped line will be activated later)
• Shop Lasco (browse more Lasco PVC fittings and plumbing parts)

Installation & Maintenance Tips

• Wrap male threads with PTFE tape (typically 2–4 wraps) and tighten snug by hand; use a wrench only for a small additional turn if needed.
• For plastic threads, avoid hard-setting pipe dope unless it’s specifically rated for PVC/CPVC and plastic threaded fittings.
• Never tighten under pressure—depressurize the line before adjusting threaded fittings.
• If you see seepage, remove the cap, clean threads, re-apply tape/sealant, and reinstall without over-tightening.
• Support nearby plumbing to reduce stress on threaded joints (pipe strain is a common cause of cracks and leaks).