1" G Thread (BSPP) Female to 3/4" NPT Male Adapter with Washer — Lead-Free Brass

This adapter connects a 1" G (BSPP) female thread to a 3/4" NPT male thread, so you can join two different plumbing standards without replacing existing pipework. It's made from lead-free brass and ships with a washer, since G (BSPP) threads are parallel and seal with a washer rather than tape or sealant. What It Connects Female side: 1" G (BSPP) — parallel thread Male side: 3/4" NPT — tapered thread Key Features Lead-free brass construction, safe for potable water Washer included for a proper seal on the G thread side Simple screw-in installation, no special tools required Common Uses Shower systems and shower arm connections Hose-to-fixture adapters Fixture retrofits where thread types don't match Specifications SKU: CSSL56160940 Material: Lead-Free Brass Finish: Brass Female Thread: 1" G (BSPP) Male Thread: 3/4" NPT Overall Length: 1 1/4" (34mm) Male Thread Diameter: 5/8" (Ø19mm) Male Thread Length: 1/2" (14mm) Hex Size (Female End): 1 3/8" (38mm) Installation Method: Screw-In Package Includes 1 x Adapter, 1" G Female to 3/4" NPT Male 1 x Washer Installation Notes Confirm your existing fittings match: 1" G female on one side, 3/4" NPT male on the other. Seat the included washer on the G thread side before threading — this is what creates the seal. Hand-tighten first, then snug with a 1 3/8" wrench. Don't overtighten. Plumber's tape can be used on the NPT male side if needed. Run water briefly and check the joint before finishing the install. FAQ Q) What's the difference between G thread and NPT thread? G thread (BSPP) is parallel and seals with a washer. NPT is tapered and seals by compression. This adapter connects the two. Q) Do I need plumber's tape? The G thread side seals with the included washer. Tape is optional on the NPT male side. Q) Is this safe for drinking water? Yes, it's lead-free brass, rated for potable water use. Q) What size wrench do I need? The hex measures 1 3/8" (38mm) across the flats. Q) Will this fit my shower system? If your shower system uses a 1" G female connection and you need to connect to 3/4" NPT, yes.