Can this be used between meter and manifold supporting 4 gas meters (small victorian apartment)?

You should contact the company about this. Instructions say it should be installed post-meter, likely because anything pre-meter should only be handled by the gas utility. Might be doable, maybe the gas utility would just need to install it themselves.

Re the pacific seismic products, 300 series, horiz. what is the direction of gas flow? and 2. where is the reset mechanism located on the unit?

There is an arrow on the unit showing the direction of the gas flow (If you enlarge the picture, you'll see it). Gas flows in from the side closest to the chain. and exit from the side closest to the knob. The knob is where you reset the unit.

Does the verticle valve work for an upward flow?

They have two different types of vertical valves. Top inlet which has the prefix VT before the model number and Bottom inlet which has the prefix VB before the model number. Up flow would need to be a VB.

how do you re-set this model ?

Use a screw driver and turn it 90 degrees at the specified slot. Easy task

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300 Series Horizontal Earthquake Gas Shut-Off Valve, 3/4-Inch

Product ID: 27829914

Details

Brand
Pacific
Exterior Finish
Steel
Global Trade Identification Number
Inlet Connection Size
0.75 inches
Inlet Connection Type
National Pipe
Item dimensions L x W x H
3.9 x 4 x 8.75

🌍Earthquake-triggered safety

🔒Manual reset, no power needed

⚙️3/4-inch NPT precision fit

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Description

🔐 Lock in safety before the next quake hits!

POWER FREE OPERATION - No batteries or electricity required—reliable mechanical trigger ensures constant readiness.
CLEAR STATUS INDICATOR - Built-in sight glass shows open/closed valve status at a glance for peace of mind.
SEISMIC ACTIVATED SAFETY - Automatically shuts gas flow during earthquakes to prevent fire hazards.
DURABLE METAL CONSTRUCTION - Robust steel body designed to withstand harsh conditions and ensure long-term protection.
PRECISION 3 4 INCH NPT FIT - Standardized inlet/outlet connections for seamless integration with existing gas lines.

The 300 Series Horizontal Earthquake Gas Shut-Off Valve by Pacific Seismic Products is a 3/4-inch swing check valve engineered to automatically stop gas flow during seismic events. Featuring a mechanical, acceleration-sensitive trigger with a steel ball mechanism, it requires no external power and includes a sight glass for easy status monitoring. Designed for easy installation upstream or downstream of gas regulators, this durable metal valve enhances home and workplace safety by reducing fire and explosion risks after earthquakes.

Specifications

ASIN	B00KHJ8SHG
Best Sellers Rank	#343,707 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #477 in Faucet Valves
Brand Name	Pacific Seismic Products
Customer Reviews	4.4 4.4 out of 5 stars (58)
Exterior Finish	Steel
Global Trade Identification Number	00804551664229
Inlet Connection Size	0.75 inches
Inlet Connection Type	National Pipe Tapered
Item Dimensions	3.9 x 4 x 8.75 inches
Item Weight	2.5 pounds
Manufacturer	Pacific Seismic Products
Manufacturer Part Number	1
Material Type	Metal
Model Number	300 Series
Number of Items	1
Number of Ports	2
Outlet Connection Size	0.75 inches
Outlet Connection Type	NPT
Size	3/4 inches
Thread Size	3/4 inches
UPC	804551664229
Unit Count	1 Count
Valve Type	Swing Check Valve

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318781CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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