MAESTRINI
Reducing nipple / female thread - male thread / brass CR
Valves & Fittings for Boats
Top products in Valves & Fittings
TRUDESIGN
Ball Valves
from
€50.95
7 variants
-17%
MAESTRINI
Thru Hull Fitting, Brass CR
€13.23
from
€10.95
8 variants
-5%
MAESTRINI
Hose nozzle / male thread / brass
€1.90
from
€1.80
19 variants
-19%
TRUDESIGN
Non-return Valve
€12.26
from
€9.95
5 variants
-6%
JABSCO
Diverter Valve
€122.62
only
€114.95
30
-21%
Heavy-Duty Stainless Steel Hose Clamps
€6.32
from
€5.00
25 variants
TRUDESIGN
Load Bearing Collar
from
€20.95
3 variants
-13%
LOCTITE 577 - Thread Sealant / for Metal Threads
€45.68
only
€39.95
(€799.00 / L)
60
TOP rated in this category
"Item corresponds to description. Good workmanship, easy assembly, excellent functionality. I recommend carefully evaluating the choice of sealing gaskets, opting for the most suitable material for your needs (hemp, Teflon tape, cyanoacrylate adhesives). When assembling, use suitable tightening tools, preferring fixed or adjustable spanners to tools such as socket wrenches or ratchet wrenches, which damage and wear the gripping points."
Reducing nipple / female thread - male thread / stainless steel
"Clean"
TRUDESIGN
Special Spanner for Ball Valve
"Perfect for dressing up"
JABSCO
Service Kit for 2-Way Valve
"A must have in your boat. You miss not having one when the Y-valve of your toilet starts leaking and the sewage water and smell spreads into the bilges... The valve also tends to scale heavily, so be prepared to spend some time removing all that stuff. But once repaired and the new O-rings and seals are fitted in, it's like new."
JABSCO
WC Check Valve incl. Accessories
"Works very well"
Brass Ball Valve with T-Handle
"Good quality"
TRUDESIGN
Connection fitting / male thread / 120° / plastic / black
"Good quality, easy to install, does what it's supposed to."
TRUDESIGN
Through-Hull Threaded Tube
"Perfect product, perfect pass form"
MAESTRINI
Pipe elbow / female thread-female thread / 90° / brass
"Screw connection fits perfectly, there is enough thread, sealed with Locktite, everything is good so far"
MAESTRINI
Swing Check Valve with Metallic Clasp
"Check valve in front of bilgePPE"
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Brands in this category
The company Maestrini srl was founded by Giulio Maestrini in 1964 in Quarona, Italy. They produce high-quality, standardized fitting pieces and accessories for assembly technology (fittings) made of bronze alloy, brass CR, brass MS58 or stainless steel. The high quality standard in production meets the requirements of ISO 9001:2008, Lloyd Register, and is also partly certified by the DVGW (German Association of Gas and Water).
Discover all MAESTRINI products now
All TruDesign products are made from the latest high-impact polymer resins and are suitable for use above and below the waterline. Based in Auckland, New Zealand, the company is ISO 9001 certified and has more than 40 years of experience in manufacturing plastic injection moulds.
Discover all TRUDESIGN products now
Simply perfect inside and out. Andersen sailboat winches are the epitome of exceptional functionality and quality. For over 60 years, Andersen has been constantly striving to meet its customers' demands, while continuing to develop new technological standards. To date, Andersen stands for design, reliability, durability and perfection.
Discover all ANDERSEN products now
VETUS is a developer, manufacturer and commercial enterprise for marine engines, generators and technical equipment on board of pleasure craft and small commercial vessels. The company was founded in 1964 by Dutchman, William Henry den Ouden.
Discover all VETUS products now
Jabsco manufactures products for recreational and marine use. These include pumps and filters, toilets, sanitary items, fresh water and sewage systems, as well as equipment. Jabsco also invented the flexible impeller pump over 60 years ago.
Need a new toilet lid for your Jabsco on-board toilet or the check valve on your Jabsco on-board toilet is defective? Use our spare parts finder for the right replacement part for your Jabsco on-board toilet!
Spare parts finder for Jabsco toilets
Discover all JABSCO products now
Find perfect fitting connectors and valves for your diesel and water lines on board. Whether you're looking for a high-quality seacock or want to replace old fittings, in our online shop for valves and fittings, you will find a wide range of affordable offers for your on-board project. We have everything, from plastic through-hulls to matching seals for check valves, ball valves and 2-way valves for your boat, and a wide range of fittings from Truedesign, Mastrini and Elvström. Find exactly the part you are looking for here!
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Valves & Fittings
- Connecting everything on board -
Threaded pipes are commonly used in gas and water technical installations. The parameters are given in inches. The diameter of the pipe is also used.
| Pipe thread inch | Outer-Ø mm |
| 1/8" | 9.73 mm |
| 1/4" | 13.16 mm |
| 3/8" | 16.66 mm |
| 1/2" | 20.95 mm |
| 5/8" | 22.91 mm |
| 3/4" | 26.44 mm |
| 7/8" | 30.20 mm |
| 1" | 33.25 mm |
| 1 1/8" | 37.90 mm |
| 1 1/4" | 41.91 mm |
| 1 3/8" | 44.32 mm |
| 1 1/2" | 47.80 mm |
| 1 3/4" | 53.74 mm |
| 2" | 59.61 mm |
Customer ratings & reviews
All reviews (203.878)
Susanna I. on 08.06.2026
Technical data and the picture of the spare part was accurate. Right spare part was easy to find in webshop. Order confirmation and the delivery were prompt. Very happy!
Andrej V. on 08.06.2026
Everything ok
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