Skip to content

Free shipping on most orders over $89!

Brands Contact Us

Country/Region

United States (USD $)

Search

Product type

All
Accessories
Air Filters

Need Help?

Call (864) 284-1801

Track Order Cart

Cart Log in Login

Menu

Systems
Replacement Filters & Cartridges
Components
Application
Water Problems
Blog
About Us
Contact Us
Clearance

Need Help?

Call (864) 284-1801

Home
Stem Fittings

Stem Fittings

Filters

Sort by:

Featured
Most relevant
Best selling

Compare

View as List Grid

FiltersFilter & Sort

Applied Filters

Clear all

Availability

In stock (532)
Out of stock (80)

Clear

Type

Adapters (432)
Couplings (13)
Manifold Fittings (5)
Plug Fittings (3)
Reducer (73)
Tee Fittings (48)

Clear

Brand

DMFit (47)
G.A. Murdock (3)
Hydronix Water Technology (3)
John Guest (143)
neoFit (272)
Parker (64)
SharkBite® (4)
Solventum (4)
Watts AquaLock/SeaTech (34)

Clear

Fitting Connection Size

1/4" Stem OD (2)
3/8" Stem OD (8)
3/16" Stem OD x 1/8" NPTF (2)
1/4" Stem OD x 1/8" NPTF (9)
1/4" Stem OD x 1/8" BSPT (2)
1/4" Stem OD x 3/16" Barb ID (3)
1/4" Stem OD x 1/4" Barb ID (10)
1/4" Stem OD x 1/4" NPTF (10)
1/4" Stem OD x 5/16" Barb ID (6)
1/4" Stem OD x 3/8" NPTF (2)
5/16" Stem OD x 1/8" NPTF (3)
5/16" Stem OD x 1/4" Barb ID (6)
5/16" Stem OD x 1/4" NPTF (4)
5/16" Stem OD x 1/4" BSPT (2)
5/16" Stem OD x 5/16" Barb ID (7)
5/16" Stem OD x 3/8" Barb ID (5)
5/16" Stem OD x 3/8" NPTF (4)
3/8" Stem OD x 1/4" Barb ID (9)
3/8" Stem OD x 1/4" NPTF (9)
3/8" Stem OD x 1/4" BSPP (2)
3/8" Stem OD x 1/4" BSPT (2)
3/8" Stem OD x 5/16" Barb ID (7)
3/8" Stem OD x 3/8" Barb ID (12)
3/8" Stem OD x 3/8" NPTF (9)
3/8" Stem OD x 3/8" BSPP (2)
3/8" Stem OD x 3/8" BSPT (2)
3/8" Stem OD x 1/2" Barb ID (5)
3/8" Stem OD x 1/2" BSPP (2)
3/8" Stem OD x 8mm Barb ID (2)
1/2" Stem OD x 3/8" NPTF (7)
1/2" Stem OD x 3/8" Barb ID (6)
1/2" Stem OD x 3/8" BSPT (2)
1/2" Stem OD x 1/2" NPTF (9)
1/2" Stem OD x 1/2" Barb ID (6)
1/2" Stem OD x 1/2" BSPP (4)
1/2" Stem OD x 1/2" BSPT (3)
3/4" Stem OD x 3/4" NPTF (2)
5/32" Tube OD x 5/32" Stem OD (3)
3/16" Tube OD x 3/16" Stem OD (2)
3/16" Tube OD x 3/8" Stem OD (2)
1/4" Tube OD x 1/4" Stem OD (12)
1/4" Tube OD x 5/16" Stem OD (3)
1/4" Tube OD x 3/8" Stem OD (15)
1/4" Tube OD x 5/8" Stem OD (2)
5/16" Tube OD x 5/16" Stem OD (5)
5/16" Tube OD x 3/8" Stem OD (7)
5/16" Tube OD x 1/2" Stem OD (3)
3/8" Tube OD x 1/4" Stem OD (3)
3/8" Tube OD x 3/8" Stem OD (13)
3/8" Tube OD x 1/2" Stem OD (4)
3/8" Tube OD x 5/8" Stem OD (2)
1/2" Tube OD x 1/2" Stem OD (9)
1/2" Tube OD x 5/8" Stem OD (4)
5/8" Tube OD x 5/8" Stem OD (3)
7/8" Tube OD x 7/8" Stem OD (4)
4mm Stem OD (2)
8mm Stem OD (5)
4mm Stem OD x 1/8" BSPP (2)
4mm Stem OD x 1/8" BSPT (2)
4mm Stem OD x 1/4" BSPT (3)
4mm Stem OD x 1/4" BSPP (2)
6mm Stem OD x 1/8" BSPP (3)
8mm Stem OD x 1/8" BSPP (3)
8mm Stem OD x 1/8" BSPT (3)
8mm Stem OD x 1/4" BSPP (3)
8mm Stem OD x 1/4" BSPT (3)
8mm Stem OD x 3/8" BSPP (3)
10mm Stem OD x 1/4" BSPT (3)
10mm Stem OD x 1/4" BSPP (2)
10mm Stem OD x 3/8" BSPP (2)
10mm Stem OD x 3/8" BSPT (2)
10mm Stem OD x 1/2" BSPP (2)
10mm Stem OD x 1/2" BSPT (2)
10mm Stem OD x 6mm Barb ID (4)
10mm Stem OD x 8mm Barb ID (4)
10mm Stem OD x 10mm Barb ID (2)
12mm Stem OD x 3/8" BSPP (2)
12mm Stem OD x 3/8" BSPT (2)
12mm Stem OD x 1/2" BSPP (2)
12mm Stem OD x 1/2" BSPT (2)
12mm Stem OD x 10mm Barb ID (2)
15mm Stem OD x 3/8" BSPP (2)
15mm Stem OD x 1/2" BSPP (3)
22mm Stem OD x 1/2" BSPP (2)
22mm Stem OD x 3/4" BSPP (3)
22mm Stem OD x 3/4" NPTF (2)
22mm Stem OD x 1" NPTF (2)
8mm Tube OD x 1/4" Stem OD (6)
10mm Tube OD x 10mm Stem OD (2)
12mm Tube OD x 12mm Stem OD (2)
15mm Tube OD x 15mm Stem OD (5)
15mm Tube OD x 22mm Stem OD (2)
22mm Tube OD x 22mm Stem OD (4)
1-1/8" Tube OD x 1-1/8" Stem OD (2)
1-1/8" Tube OD x 1-1/8" Stem OD x 1-1/8" Stem OD (2)
1-1/8" Tube OD x 15mm Stem OD x 15mm Tube OD (2)
1/2" Tube OD x 1/2" Stem OD x 1/2" Tube OD (2)
1/4" Tube OD x 1/4" Stem OD x 1/4" Tube OD (2)
1/4" Tube OD x 1/4" Tube OD x 1/4" Stem OD (2)
3/8" Tube OD x 3/8" Stem OD x 3/8" Tube OD (2)

Clear

Push-In Size

3/8" ID (2)
1/2" ID (1)
3/4" ID (1)
5/32" OD (6)
3/16" OD (6)
1/4" OD (48)
5/16" OD (23)
3/8" OD (42)
1/2" OD (23)
5/8" OD (11)
7/8" OD (8)
1-1/8" OD (8)
4mm OD (4)
5mm OD (1)
6mm OD (6)
8mm OD (7)
8 mm OD (1)
10mm OD (7)
12mm OD (5)
15mm OD (11)
22mm OD (6)
4mm (5/32") OD (1)
8mm (5/16") OD (8)

Clear

Stem Size

5/32" OD (7)
3/16" OD (4)
1/4" OD (72)
5/16" OD (53)
3/8" OD (122)
1/2" OD (66)
5/8" OD (20)
3/4" OD (1)
7/8" OD (13)
1" OD (2)
1-1/8" OD (9)
4mm OD (11)
6mm OD (20)
8mm OD (25)
10mm OD (30)
12mm OD (16)
15mm OD (21)
22mm OD (19)
28mm OD (4)

Clear

Barb Size

3/16" (5)
1/4" (26)
5/16" (21)
3/8" (25)
1/2" (15)
5/8" (2)
3/4" (1)
4mm (2)
6mm (8)
8mm (4)
10mm (4)

Clear

Seal / O-Ring Material

Buna-N (Nitrile) (151)
EPDM (127)
FKM (Viton®) (15)

Clear

Valve Type

Valved (3)

Clear

Application

Reverse Osmosis (3)

Clear

Color / Finish

Black (166)
Brass (19)
Gray (140)
Natural White (92)
True White (2)
White (152)

Clear

Shape

Elbow (140)
Straight (381)
Tee (49)
Wye (2)

Clear

Series

24 Series (1)
35 Series (19)
Acetal (42)
Brass (7)
CI (3)
Inch (19)
LIQUIFit (32)
Metric (60)
MM (3)
NC-ITM (1)
Par-Barb (5)
PEI (9)
PEM (7)
PI (65)
PM (9)
Polypropylene (1)
PP (29)
ProLock (7)
TrueSeal (26)

Clear

Sort by:

Featured
Most relevant
Best selling

Compare

neoFit
NeoFit - Acetal Black Stem Reducer 12mm tube x 15mm stem

5.0

Regular price From $3.13

Part #: ARD1215M-E

Save up to 7% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Adapter 1/2" stem x 3/8" NPTF

Regular price From $1.32

Part #: ASA8-N3-E

Save up to 8% with bulk pricing
Compare

Watts AquaLock/SeaTech
Watts AquaLock/SeaTech - Reducing Branch Stackable Tee - 3/4 CTS Stem x 3/4 CTS x 1/2 CTS Branch

Regular price From $17.99

Part #: 3533R-1410

Save up to 4% with bulk pricing
Compare

Parker
Parker LIQUIfit Stem Adapter - 1/4 x 3/8 NPTF

Regular price From $0.89

Part #: 6521-56-18WP2

Save up to 5% with bulk pricing
Compare

Sold Out

Parker
Parker LIQUIfit Stem Adapter - 1/4 x 1/8 NPTF

Regular price $0.63

Sold out

Part #: 6521-56-11WP2
Compare

Parker
Parker LIQUIfit Stem To Hose Barb - 3/8 x 5/16 Barb

Regular price From $2.35

Part #: 6322-60-08WP2

Save up to 5% with bulk pricing
Compare

John Guest
John Guest Stem Adapter BSPT - 3/8 x 1/4 BSPT

Regular price From $1.37

Part #: PI051202S

Save up to 8% with bulk pricing
Compare

John Guest
John Guest Brass Male Stem Adapter BSPT - 22mm x 3/4 BSPT

Regular price From $10.84

Very low stock

Part #: MW052206N

Save up to 7% with bulk pricing
Compare

Parker
Kynar PVDF Tube Stem 90 Barb - 3/8

Regular price $4.94

Part #: F6TEB6
Compare

John Guest
John Guest Stem Adapter BSPP - 5/16 x 1/4 BSPP

Regular price From $0.78

Part #: PM050812S

Save up to 12% with bulk pricing
Compare

John Guest
John Guest Stem Adapter NPTF - 5/16 x 3/8 NPTF

Regular price From $1.05

Part #: PM050823S

Save up to 17% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Reducer 3/8" tube x 8mm (5/16") stem

Regular price From $1.73

Part #: ARD8M6-E

Save up to 14% with bulk pricing
Compare

neoFit
Stem Reducer Check Valve 1/4 OD x 1/4 OD Stem

Regular price From $1.99

Part #: ACVUS-44

Save up to 5% with bulk pricing
Compare

neoFit
NeoFit - Acetal White Stem Reducer 1/4" tube x 3/8" stem

Regular price From $2.20

Part #: ARD46W

Save up to 49% with bulk pricing
Compare

neoFit
NeoFit - Acetal Natural White Stem Reducer 1/2" tube x 3/8" stem

Regular price From $2.98

Part #: ARD68-W

Save up to 8% with bulk pricing
Compare

neoFit
NeoFit - Acetal Gray Stem Branch Tee 3/8" tube x stem 3/8"

Regular price From $1.92

Backordered

Part #: ATBU666-G

Save up to 8% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Reducer 15mm tube x 22mm stem

Regular price From $2.86

Part #: ARD2215M-E

Save up to 18% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Elbow 4mm tube x 4mm stem

Regular price From $1.79

Part #: ATEU44M-E

Save up to 25% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Reducer 10mm tube x 8mm stem

Regular price From $1.76

Part #: ARD108M-E

Save up to 9% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Reducer 8mm tube x 12mm stem

Regular price From $1.93

Part #: ARD128M-E

Save up to 8% with bulk pricing
Compare

John Guest
John Guest Stackable Reducer Stem - 1 Stem x 3/4 CTS

Regular price From $6.11

Part #: PEI063628

Save up to 5% with bulk pricing
Compare

John Guest
John Guest Brass Female Stem Adapter BSP - 22mm x 3/4 BSP

Regular price From $11.62

Part #: MW502216N

Save up to 7% with bulk pricing
Compare

DMFit
DMfit Stem Adapter - 3/8" stem x 3/8" BSPT(PT)

Regular price From $1.92

Part #: ASABT0606

Save up to 18% with bulk pricing
Compare

neoFit
NeoFit - Polypropylene Natural White Reducer 3/8" OD x 1/2" Stem

Regular price From $1.84

Part #: PRD68-W

Save up to 7% with bulk pricing
Compare

neoFit
Stem Reducer Acetal 1/4" Tube OD x 3/8" Stem OD

Regular price From $1.99

Part #: ASU-46

Save up to 5% with bulk pricing
Compare

neoFit
NeoFit - Polypropylene Natural White Stem Adapter 1/2" Stem x 1/2" NPTF

Regular price From $0.85

Part #: PSA8-N4-W

Save up to 7% with bulk pricing
Compare

neoFit
NeoFit - Acetal Black Stem Run Tee 1/2" tube x stem 1/2"

Regular price From $2.57

Part #: ATRU888-E

Save up to 9% with bulk pricing

Showing 270 of 574

Want to learn more?

Your cart

Your cart is empty

Subtotal:$0.00 USD

Loading...

M - F 8:00am to 7:00pm EST

Call: (864) 284-1801

Toll Free: (877) 930-7295

2299 Ridge Road Greenville, SC 29607

3195 W Professional Circle Suite 200 - Salt Lake City, UT 84104

Facebook
YouTube
Instagram
LinkedIn

Shop

Water Filtration & Treatment Systems
Pumps & Motors
Fittings & Valves
Filter Housings & Components
Filters & Media
Tubing & Hoses
Food & Beverage Filtration Systems
Clearance
Parts & Accessories
Under-Sink & Countertop Water Filters
Brands
View All Categories

Help

Track My Order
Get a Quote
Shipping
Bulk Pricing
Returns
Contact Us

Info

About Us
neo™ Brand
Cleanroom Facility
Blog
Careers
Local Pickup
Industries
Certifications & Quality Standards

Payment methods accepted

Country/Region

United States (USD $)

© 2026 Fresh Water Systems - All Rights Reserved

Terms and Conditions
Privacy Policy
Accessibility

Compare /3

Loading...

Loading...

Choose options

Item added to your cart.

View cart