can I use this for hot water conxt, and on brass / copper?

Absolutely, I’ve used it for that and also for natural gas and gasoline with excellent results.

I need to connect npt threaded stainless steel male fitting to a plastic female inlet on a water filter. t plus 2 or tru-blu or another sealant?

I typically don’t use anything but Teflon tape on any plastic fittings. Chemicals in liquid or paste sealants could soften the plastic.

Can this be used on gasoline fuel lines

Yes. The Product Document Sheet says it is suitable for use with gasoline, both leaded and unleaded.

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RectorSeal Tru-Blu 31631 Pipe Thread Sealant, Fast-Dry, PTFE Enriched, Plumbing, Designed for high Vibration environments and Thermal Expansion/Contraction, 1/4 Pint

Product ID: 14156074

Details

Brand
Rectorseal
Item Weight
6.72 ounces
Item dimensions L x W x H
2 x 2 x 3.5
Material
Style
Thread

⚡Fast-dry formula

🔧PTFE enriched for superior thread lubrication

🌡️Designed for high vibration & thermal expansion

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€ 24.90

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal it fast, seal it right — the pro’s choice for unstoppable plumbing!

PTFE POWERHOUSE - Enriched with PTFE for smooth, leak-proof thread sealing and enhanced durability.
LEAD FREE ECO SAFE - Protect your pipes and the planet with a non-toxic, metal-free sealant trusted by pros.
VIBRATION PROOF SEAL - Engineered to withstand high vibration environments, perfect for HVAC and industrial use.
UNIVERSAL COMPATIBILITY - Works flawlessly on galvanized steel, brass, copper, PVC, stainless steel, and more.
RAPID SET ZERO DOWNTIME - Fast-dry formula ensures quick project turnaround without waiting.

RectorSeal Tru-Blu 31631 is a fast-drying, PTFE-enriched pipe thread sealant designed for professional plumbers and home improvement experts. It delivers flexible, water-resistant sealing that excels in high vibration and thermal expansion environments. Compatible with a wide range of materials including metals and plastics, this lead-free, metal-free formula lubricates and protects threads for reliable, leak-proof connections.

Specifications

ASIN	B0012YO0Z4
Best Sellers Rank	#1,233 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Industrial Thread Sealants
Brand Name	Rectorseal
Color	Blue
Compatible Material	Polyvinyl Chloride
Customer Reviews	4.7 4.7 out of 5 stars (2,034)
Global Trade Identification Number	00021449316316
Included Components	Unit^Instruction Guide
Item Dimensions	2 x 2 x 3.5 inches
Item Form	Paste
Item Type Name	Pipe Sealant
Item Weight	6.72 ounces
Manufacturer	The Rectorseal Corporation
Material Type	Polytetrafluoroethylene
Model	31631
Number of Items	1
Part Number	31631
Style Name	Thread Sealants
Surface Recommendation	Pipe
UPC	021449316316
Unit Count	1.0 Count
Warranty Description	Warranty
Water Resistance Level	Water Resistant

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