Description
Proline’s full-port PVC ball valve gives you fast, reliable on/off flow control on any 3/4″ NPT threaded line — the shutoff you install before and after a filter system so future service is a quick turn of a handle, not a house-wide shutdown.
What it does
A quarter-turn ball valve is the simplest reliable way to isolate a section of plumbing: handle in line with the pipe = open, handle across the pipe = closed. Install one on the inlet and one on the outlet of your filter system and every future filter change becomes a two-valve turn instead of shutting off the whole house.
This is a full-port design — the hole through the ball is the same diameter as the pipe, so when the valve is open there’s essentially no flow restriction. Both ends are 3/4″ FNPT (female threaded), so a standard 3/4″ MNPT nipple or threaded pipe threads directly into either end.
Key benefits
- ✓Quarter-turn on/off — instant open, instant closed, no leaks from a slow-drip gate valve
- ✓Full-port design — no flow restriction when open
- ✓3/4″ FNPT × FNPT — standard fit for whole-house filter shutoffs
- ✓Rated to 150 PSI — well above typical residential water pressure (40–80 PSI)
- ✓Corrosion-proof PVC — won’t rust, seize, or leach into potable water
- ✓Bright red handle — easy visual confirmation of open/closed state
Specifications
| Brand / Manufacturer |
Proline |
| Valve type |
Ball valve, quarter-turn |
| Material |
PVC |
| Connection |
3/4″ FNPT × 3/4″ FNPT (female threaded, both ends) |
| Port style |
Full port (no flow restriction) |
| Max pressure |
150 PSI |
| Application |
Plumbing, whole-house filters, RO systems, potable water |
| Sold as |
Single unit (1 valve) |
| Dimensions |
6 × 6 × 3 in |
| Weight |
0.4 lbs |
| SKU |
BV-34-FNPT (legacy: BALLVALVE34, 34VALVEFNPT) |
Compatibility
✓ Works with
- 3/4″ NPT threaded pipe (PVC, copper, brass, poly)
- 3/4″ MNPT union nipples — threads directly in
- Whole-house filter installs (one before, one after the system)
- Cold potable-water lines up to 150 PSI
× Not for
- Hot-water lines (PVC softens at high temps)
- Gas, compressed air, or industrial chemicals
- Solvent-weld (glued) pipe — this valve is threaded, not socket
- 1″ or 1/2″ NPT pipe (wrong thread size)
Often used with
Union Nipple 3/4″ MNPT × 2
Threads into the valve for housing-to-valve joints
View product →
PTFE Thread Seal Tape
Required for a leak-free threaded seal
View product →
Long-Reach Housing Wrench
For filter changes on slim housings
View product →
Installer & plumber bulk pricing
Buying valves in quantities of
10 or more? You may qualify for
special volume pricing.
Contact us for installer or repeat-order pricing.
Good to know before you buy
- Use PTFE thread tape. Both ends are FNPT threads without an O-ring — the seal is on the threads themselves, so tape or thread sealant is required.
- Standard install: one valve on the inlet, one on the outlet of your filter system. Isolates the system for filter changes without shutting off the house.
- Don’t over-tighten. Hand-tight plus 1–2 turns with a wrench is usually enough. Cranking on PVC threads cracks the valve body.
- Handle in line with pipe = open. Handle across pipe = closed. If you can’t reach the handle when installed, you may need a longer stem valve or repositioned install.
- Cold water only. For hot-water lines, use a brass or CPVC ball valve instead.
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